LESSON 1: PYTHON-FLOWCHARTS, INPUTS, AND VARIABLES

Example text
Go ahead and replace it with
your own text. This is an
example text.

PYTHON TO GO: Synthesis & Evaluation

Learning Objectives

PYTHON SCENARIO: What is Python?

PYTHON SCENARIO: What is Python?

PYTHON CORNER: What do you think?

PYTHON EXPLORE: Algorithms & Flowcharts

What is Python?

 Python

is

a

general

purpose

programming

language

that

is

often

applied

in

scripting

roles.

 So,

Python

is

programming

language

as

well

as

scripting

language.

 Python

is

also

called

as

Interpreted language

Differences between program

and scripting language

Program

Scripting

 a

program

is

executed

(i.e.

the

source

is

first

compiled,

and

the

result

of

that

compilation

is

expected)

 A

"program"

in

general,

is

a

sequence

of

instructions written
so

that

a

computer

can

perform

certain

task.

 a script is interpreted

 A

"script"

is

code

written

in

a scripting language. A
scripting

language

is

nothing

but

a

type

of

programming language in
which we can write code
to

control

another

software

application.

History of Python

BACK DROP

Source: Wikipedia

 Invented

in

the

Netherlands,

early

90s by Guido van Rossum

 Python

was

conceived

in

the

late

1980s

and

its

implementation

was

started in December 1989

 Guido

Van

Rossum

is

fan

of

‘Monty

Python’s

Flying

Circus’,

this

is

a

famous TV show in Netherlands

 Named after Monty Python

 Open sourced from the beginning

Python’s Benevolent Dictator For Life

“Python

is

an

experiment

in

how

much

freedom

programmers

need.

Too

much

freedom

and

nobody

can

read

another's

code;

too

little

and

expressiveness

is endangered.”

- Guido van Rossum

Why was python created?

"My original motivation for creating Python
was the perceived need for a higher level
language in the Amoeba [Operating Systems]
project.

I

realized

that

the

development

of

system

administration

utilities

in

C

was

taking

too

long.

Moreover,

doing

these

things

in

the

Bourne

shell

wouldn't

work

for a variety of reasons. ...

So,

there

was

a

need

for

a

language

that

would

“bridge

the

gap

between

C

and

the shell”

- Guido Van Rossum

Example text
Go ahead and replace it with
your own text. This is an
example text.

PYTHON CORNER: What do you think?

PYTHON EXPLORE: Algorithms & Flowcharts

PYTHON TO GO: Synthesis & Evaluation

Learning Objectives

PYTHON SCENARIO: What is Python?

PYTHON CORNER: What do you think?

What can I do with Python?

System programming

Graphical User Interface

Programming

Internet Scripting

Component Integration

Database Programming

Gaming, Images, XML , Robot

and more

PYTHON CORNER

Who uses python today…

 Python

is

being

applied

in

real

revenue-

generating products by real companies. For
instance:

 Google makes extensive use of Python in its

web

search

system,

and

employs

Python’s

creator.

 Intel,

Cisco,

Hewlett-Packard,

Seagate,

Qualcomm,

and

IBM

use

Python

for

hardware

testing.

 ESRI

uses

Python

as

an

end-user

customization

tool

for

its

popular

GIS

mapping products.

 The

YouTube

video

sharing

service

is

largely written in Python

Why do people use Python?

The following primary factors cited by

Python Users seem to be these:

 Python is object-oriented

Structure supports such concepts as
polymorphism, operation overloading, and
multiple inheritance.

 Indentation

Indentation

is

one

of

the

greatest

future

in

Python.

 It's free (open source)

Downloading and installing Python is free and
easy and the source code is easily accessible

 It's powerful

-

Dynamic typing

-

Built-in types and tools

-

Library utilities

-

Third party utilities (e.g. Numeric,
NumPy, SciPy)

-

Automatic memory management

 It's portable

-Python

runs

virtually

every

major

platform

used

today
-

As

long

as

you

have

a

compatible

Python

interpreter installed, Python programs will run in
exactly the same manner, irrespective of platform.

Why do people use Python?

 It's mixable

- Python can be linked to components written in other
languages easily
-

Linking

to

fast,

compiled

code

is

useful

to

computationally intensive

problems

- Python/C integration is quite common

 It's easy to use

-

No intermediate compile and link steps as in C/

C++
- Python programs are compiled automatically to an
intermediate

form

called

bytecode,

which

the

interpreter then reads
-

This

gives

Python

the

development

speed

of

an

interpreter without

the

performance

loss

inherent in purely interpreted languages

 It's easy to learn

-

Structure

and

syntax

are

pretty

intuitive

and

easy to grasp

Why do people use Python?

Installing Python

 Python is pre-installed on most

Unix systems, including Linux
and MAC OS X

 But for in Windows Operating Systems

,

user

can

download

from

the

https://www.python.org/downloads/
-

from

the

above

link

download

latest

version

of

python

IDE

and

install,

recent

version

is

3.7.1

but most of them uses version 2.7.7
only

 After installing the

Python

Ver#3.7.1,

go to start menu
then

click

on

python 3.7 in that
one you can select
python

(command

line) it is prompt
with >>>

Installing Python - Testing

Installing Python - Android

 Go to Google

Play store

 Search Python

3 (Pydroid 3)

Installing Python - Android

 Open Pyroid

via playstore

 Open Pyroid

via phone app

Installing Python - Android

 Open the app and it

will

automatically

install.

 Then

type

in

this

command and press the
yellow play button to
test if it’s working.

Installing Python – iPadOS

Example text
Go ahead and replace it with
your own text. This is an
example text.

PYTHON CORNER: What do you think?

PYTHON EXPLORE: Algorithms & Flowcharts

PYTHON TO GO: Synthesis & Evaluation

Learning Objectives

PYTHON SCENARIO: What is Python?

PYTHON EXPLORE: Algorithms & Flowcharts

PYTHON EXPLORE
Algorithms and Flowcharts

 A typical programming task can

be divided into two phases:

 Problem solving phase

 produce an ordered sequence of steps

that describe solution of problem

 this sequence of steps is called an

algorithm

 Implementation phase

 implement the program in some

programming language

PYTHON EXPLORE
Algorithms and Flowcharts

Steps in Problem Solving

 First

produce

a

general

algorithm

(one can use pseudocode)

 Refine

the

algorithm

successively

to

get

step

by

step

detailed

algorithm that is very close to a
computer language.

 Pseudocode

is

an

artificial

and

informal

language

that

helps

programmers

develop

algorithms.

Pseudocode

is

very

similar

to

everyday English.

PYTHON EXPLORE
Algorithms and Flowcharts
Pseudocode & Algorithm

Example

1:

Write

an

algorithm

to

determine

a

student’s

final

grade

and

indicate

whether

it

is

passing

or

failing.

The

final grade is calculated as
the average of four marks.

PYTHON EXPLORE
Algorithms and Flowcharts
Pseudocode & Algorithm

Pseudocode:
 Input a set of 4 marks
 Calculate their average by

summing and dividing by 4

 if average is below 75

Print “FAIL”

else

Print “PASS”

PYTHON EXPLORE
Algorithms and Flowcharts
Pseudocode & Algorithm

 Detailed Algorithm



Step 1: Input M1,M2,M3,M4
Step 2: GRADE  (M1+M2+M3+M4)/4
Step 3: if (GRADE < 75) then

Print “FAIL”

else

Print “PASS”

endif

PYTHON EXPLORE
Algorithms and Flowcharts

The Flowchart

 (Dictionary)

A

schematic

representation

of

a

sequence

of

operations,

as

in

a

manufacturing process or computer program.

 (Technical)

A

graphical

representation

of

the

sequence

of

operations

in

an

information

system

or

program.

Information

system flowcharts show how data flows from
source

documents

through

the

computer

to

final

distribution

to

users.

Program

flowcharts

show

the

sequence

of

instructions

in

a

single

program

or

subroutine.

Different

symbols

are

used

to

draw each type of flowchart.

PYTHON EXPLORE
Algorithms and Flowcharts

A Flowchart

shows logic of an algorithm

emphasizes

individual

steps

and their interconnections

e.g.

control

flow

from

one

action to the next

PYTHON EXPLORE
Algorithms and Flowcharts
Basic Flowchart Symbols

Oval

Parallelogram

Rectangle

Diamond

Hybrid

Name

Symbol

Use in Flowchart

Denotes the beginning or end of the program

Denotes an input operation

Denotes an output operation

Denotes a decision (or branch) to be made.
The program should continue along one of
two routes. (e.g. IF/THEN/ELSE)

Denotes a process to be carried out
e.g. addition, subtraction, division etc.

Flow line

Denotes the direction of logic flow in the program

PYTHON EXPLORE
Algorithms and Flowcharts

Example 1

PRINT
“PASS”

START

Input

M1,M2,M3,M4

GRADE(M1+M2+M3+M4)/4

IS

GRADE<75

PRINT
“FAIL”

STOP

Y

N

Step 1: Input M1,M2,M3,M4
Step 2: GRADE  (M1+M2+M3+M4)/4
Step 3: if (GRADE <75) then

Print “FAIL”

else

Print “PASS”

endif

PYTHON EXPLORE
Algorithms and Flowcharts

Example 2

 Write

an

algorithm

and

draw

a

flowchart to convert the length in
feet to centimeter.

Pseudocode:



Input the length in feet (Lft)

 Calculate

the

length

in

cm

(Lcm)

by multiplying LFT with 30

 Print length in cm (LCM)

PYTHON EXPLORE
Algorithms and Flowcharts

Example 2

Algorithm

 Step 1:

Input Lft

 Step 2:

Lcm  Lft x 30

 Step 3:

Print Lcm

START

Input

Lft

Lcm  Lft x 30

Print
Lcm

STOP

Flowchart

PYTHON EXPLORE
Algorithms and Flowcharts

Example 3

Write an algorithm and draw a flowchart
that

will

read

the

two

sides

of

a

rectangle and calculate its area.

Pseudocode

 Input the width (W) and Length (L) of a

rectangle

 Calculate the area (A) by multiplying L

with W

 Print A

PYTHON EXPLORE
Algorithms and Flowcharts

Example 3

Algorithm

 Step 1:

Input W,L

 Step 2:

A  L x W

 Step 3:

Print A

START

Input
W, L

A  L x W

Print

A

STOP

PYTHON EXPLORE
Algorithms and Flowcharts

Example 4

 Write

an

algorithm

and

draw

a

flowchart

that

will

calculate

the

roots of a quadratic equation

 Hint:

d

=

sqrt

(

),

and

the

roots are:

x1 = (–b + d)/2a

and x2

= (–b – d)/2a

2

0

ax

bx

c

+

+

=

2

4

b

ac

−

PYTHON EXPLORE
Algorithms and Flowcharts

Example 4

Pseudocode:

 Input the coefficients (a, b, c)

of the quadratic equation

 Calculate d

 Calculate x1

 Calculate x2

 Print x1 and x2

PYTHON EXPLORE
Algorithms and Flowcharts

Example 4

 Algorithm:

 Step 1: Input a, b, c

 Step 2: d  sqrt( )

 Step 3: x1  (–b + d) / (2 x a)

 Step 4: x2  (–b – d) / (2 x a)

 Step 5: Print x1, x2

4

b b

a c

 −  

START

Input
a, b, c

d  sqrt(b x b – 4 x a x c)

Print
x1 ,x2

STOP

x1 (–b + d) / (2 x a)

X2  (–b – d) / (2 x a)

PYTHON EXPLORE
Algorithms and Flowcharts

Decision Structures

 The

expression

A>B

is

a

logical

expression

 it describes a condition we want to

test

 if A>B is true (if A is greater than

B) we take the action on left

 print the value of A

 if A>B is false (if A is not greater

than B) we take the action on right

 print the value of B

PYTHON EXPLORE
Algorithms and Flowcharts

Decision Structures

is

A>B

Print B

Print A

Y

N

PYTHON EXPLORE
Algorithms and Flowcharts

If – Then - Else Structures

The structure is as follows
If condition then

true alternative

else

false alternative

endif

PYTHON EXPLORE
Algorithms and Flowcharts

If – Then - Else Structures

 The

algorithm

for

the flowchart is as
follows:

If A>B then

print A

else

print B

endif

is

A>B

Print B

Print A

Y

N

PYTHON EXPLORE
Algorithms and Flowcharts

Relational Operators

Relational Operators

Operator

Description

>

Greater than

<

Less than

=

Equal to



Greater than or equal to



Less than or equal to



Not equal to

PYTHON EXPLORE
Algorithms and Flowcharts

Example 5

 Write an algorithm that reads two values,

determines

the

largest

value

and

prints

the

largest

value

with

an

identifying

message.

ALGORITHM
Step 1:

Input VALUE1, VALUE2

Step 2:

if (VALUE1 > VALUE2) then

MAX  VALUE1

else

MAX  VALUE2

endif

Step 3:

Print “The largest value is”, MAX

PYTHON EXPLORE
Algorithms and Flowcharts

Example 5

MAX VALUE1

Print

“The largest value is”, MAX

STOP

Y

N

START

Input

VALUE1,VALUE2

MAX VALUE2

is

VALUE1>VALUE2

PYTHON EXPLORE
Algorithms and Flowcharts

Nested IFs

One of the alternatives

within

an

IF–THEN–ELSE

statement

may

involve

further

IF–THEN–ELSE statement

PYTHON EXPLORE
Algorithms and Flowcharts

Example 6

Write an algorithm that
reads three numbers and
prints the value of the
largest number.

PYTHON EXPLORE
Algorithms and Flowcharts

Example 6

Step 1: Input

N1, N2, N3

Step 2: if (N1>N2) then

if (N1>N3) then

MAX  N1

[N1>N2, N1>N3]

else

MAX  N3

[N3>N1>N2]

endif

else

if (N2>N3) then

MAX  N2

[N2>N1, N2>N3]

else

MAX  N3

[N3>N2>N1]

endif

endif

Step 3: Print “The largest number is”, MAX

PYTHON EXPLORE
Algorithms and Flowcharts

Example 6

 Flowchart: Draw the flowchart of the

above Algorithm.

PYTHON EXPLORE
Algorithms and Flowcharts

Example 7



Write the algorithm and draw a
flowchart to

a) read an employee name (NAME),

overtime hours worked
(OVERTIME), hours absent
(ABSENT) and

b) determine the bonus payment

(PAYMENT).

PYTHON EXPLORE
Algorithms and Flowcharts

Example 7

Bonus Schedule

OVERTIME –

(2/3)*ABSENT

Bonus Paid

>40 hours
>30 but  40 hours
>20 but  30 hours
>10 but  20 hours

10 hours

$50
$40
$30
$20
$10

PYTHON EXPLORE
Algorithms and Flowcharts

Example 7

Step 1: Input NAME,OVERTIME,ABSENT
Step 2: if (OVERTIME–(2/3)*ABSENT > 40) then

PAYMENT  50

else if (OVERTIME–(2/3)*ABSENT > 30) then

PAYMENT  40

else if (OVERTIME–(2/3)*ABSENT > 20) then

PAYMENT  30

else if (OVERTIME–(2/3)*ABSENT > 10) then

PAYMENT 20

else

PAYMENT  10

endif

Step 3: Print “Bonus for”, NAME “is $”, PAYMENT

PYTHON EXPLORE
Algorithms and Flowcharts

Example 7

 Flowchart: Draw the flowchart of the

above algorithm?

Example text
Go ahead and replace it with
your own text. This is an

PYTHON CORNER: What do you think?

PYTHON EXPLORE: Algorithms & Flowcharts

PYTHON TO GO: Synthesis & Evaluation

Learning Objectives

PYTHON SCENARIO: What is Python?

PYTHON TO GO: Synthesis & Evaluation

Simple coding 1:
In Python 2, the "print"

statement

is

not

a

function,

and

therefore

it

is

invoked

without

parentheses.

However,

in

Python

3,

it

is

a

function,

and

must

be

invoked

with

parentheses.
Example:

Basic Python Programming Activity

NOTE: difference between Python 2 and 3 is the print statement

PYTHON TO GO

Simple

coding

4:
Python

is

completely

object oriented, and not "statically typed". You do
not need to declare variables before using them, or
declare their type. Every variable in Python is an
object.
(2)

Strings:
Strings

is

defined

either

with

a

single

quote

or

a

double

quotes.

Basic Python Programming Activity

NOTE: Python basic types of variables

PYTHON TO GO

Simple

coding

2:
Python

uses

indentation

for

blocks,

instead

of

curly

braces. Both tabs and spaces are supported,
but

the

standard

indentation

requires

standard Python code to use four spaces.

Example:

Basic Python Programming Activity

NOTE: difference between Python 2 and 3 is the print statement

PYTHON TO GO

Basic Python Programming Activity

Python Exercise 1:
Use the "print"

command to print the line "Hello, World!”.

Python

Exercise

2:
Use

the

"print"

command to print the line ”whatever you want to to
say”.

PYTHON TO GO

Simple coding 3:
Python

is

completely

object oriented, and not "statically typed". You do
not need to declare variables before using them, or
declare their type. Every variable in Python is an
object. As in every language, a variable is the name
of a memory location. A variable has the type that
corresponds to the value you assign to it Variable
names begin with a letter or an underscore and can
contain letters, numbers, and underscores
(1)

Numbers:
Python

supports

two

types

of

numbers - integers and floating point numbers.

Basic Python Programming Activity

NOTE: Python basic types of variables

Question:
What

is

the

difference

between

an

integers and floating point numbers?

PYTHON TO GO

Simple

coding

3:
Python

is

completely

object

oriented,

and

not

"statically

typed".

You

do

not

need

to

declare

variables

before

using

them,

or

declare

their

type.

Every

variable

in

Python is an object.
Integers:
To

define

an

integer,

use

the

following

syntax:

Basic Python Programming Activity

NOTE: Python basic types of variables

PYTHON TO GO

Simple

coding

3:
Python

is

completely

object oriented, and not "statically typed". You do
not need to declare variables before using them, or
declare their type. Every variable in Python is an
object.
Floating

number:
To

define

a

floating

point

number,

you

may

use

one

of

the

following

notations:

Basic Python Programming Activity

NOTE: Python basic types of variables

PYTHON TO GO

Simple

coding

4:
Python

is

completely

object oriented, and not "statically typed". You do
not need to declare variables before using them, or
declare their type. Every variable in Python is an
object.
(2) Strings:
Strings is defined either with

a single quote or a double quotes.

Basic Python Programming Activity

NOTE: Python basic types of variables

PYTHON TO GO

Simple

coding

4:
Python

is

completely

object oriented, and not "statically typed". You do
not need to declare variables before using them, or
declare their type. Every variable in Python is an
object.
(2)

Strings:
Strings

is

defined

either

with

a

single

quote

or

a

double

quotes.

The difference between the two is that using double
quotes makes it easy to include apostrophes (whereas
these

would

terminate

the

string

if

using

single

quotes).

Basic Python Programming Activity

NOTE: Python basic types of variables

PYTHON TO GO

Simple

coding

4:
Python

is

completely

object oriented, and not "statically typed". You do
not need to declare variables before using them, or
declare their type. Every variable in Python is an
object.
(2)

Strings:
Strings

is

defined

either

with

a

single

quote

or

a

double

quotes.

Basic Python Programming Activity

NOTE: Python basic types of variables

PYTHON TO GO

Strings

Simple

Coding

5:
There

are

additional variations on defining strings that make
it

easier

to

include

things

such

as

carriage

returns, backslashes and Unicode characters. Simple
operators can be executed on numbers and strings:

Basic Python Programming Activity

NOTE: Python basic types of variables

PYTHON TO GO

Simple Coding 6:
Assignments can be done on more

than one variable "simultaneously" on the same line like
this:

Basic Python Programming Activity

Simple

Coding

6:
BUT…BUT…BUT…:P

:P

:P

Mixing

operators

between

numbers

and

strings

is

NOT

supported:

PYTHON TO GO

Basic Python Programming Activity
Python Exercise 3:
The target of this exercise

is to create a string, an integer, and a floating point number.
The string should be named mystring and should contain the word
"hello". The floating point number should be named myfloat and
should

contain

the

number

10.0,

and

the

integer

should

be

named myint and should contain the number 20

PYTHON TO GO

LIST

Simple

Coding

7:
Lists

are

very

similar to arrays. They can contain any type of variable,
and they can contain as many variables as you wish. Lists
can also be iterated over in a very simple manner. Here is
an example of how to build a list.

Basic Python Programming Activity

NOTE:Accessing an index which does not
exist generates an exception (an error).

PYTHON TO GO

Basic Python Programming Activity
Python Exercise 4:
In this exercise, you will need

toadd numbers

and strings to the correct

lists using

the

"append"

list

method. You must add the numbers 1,2, and 3 to the "numbers" list, and the
words 'hello' and 'world' to the strings variable.
You will also have to fill in the variable second_name with the second name
in the names list, using the brackets operator [ ]. Note that the index is
zero-based, so if you want to access the second item in the list, its index
will be 1.

PYTHON TO GO

Basic Python Programming Activity
Solution

Python

Exercise

4:
Inthis

exercise,

you

will

need

toadd

numbers

and

strings

tothe

correct

lists

using

the

"append" list method. You must add the numbers 1,2, and 3 to the "numbers" list, and
the words 'hello' and 'world' to the strings variable. You will also have to fill in
the variable second_name with the second name in the names list, using the brackets
operator [ ]. Note that the index is zero-based, so if you want to access the second
item in the list, its index will be 1.

PYTHON TO GO

Simple Coding 8:
Arithmetic Operators Just as

any

other

programming

languages,

the

addition,

subtraction, multiplication, and division operators can be
used with numbers.

Basic Python Programming Activity

Another operator available is the modulo (%) operator, which returns
the integerremainder of the division. dividend % divisor = remainder.

PYTHON TO GO

Simple Coding 8:
Arithmetic

Operators

Using

two

multiplication

symbols

makes

a

power

relationship.

Basic Python Programming Activity

Using Operators with Strings
Python

supports

concatenating

strings

using

the

addition

operator:

PYTHON TO GO

Simple Coding 8:
Arithmetic Operators Python

also supports multiplying strings to form a string with a
repeating sequence:

Basic Python Programming Activity

Using Operators with Lists
Lists can be joined with the addition operators:

PYTHON TO GO

Simple

Coding

8:
Arithmetic

Operators

Just

as

in

strings,

Python

supports forming new lists with a repeating
sequence using the multiplication operator:

Basic Python Programming Activity

PYTHON TO GO

Basic Python Programming Activity
Python Exercise 5:
The target of this exercise is

to create two lists called x_list and y_list, which contain 10 instances of
the variables x and y, respectively. You are also required to create a list
called big_list, which contains the variables x and y, 10 times each, by
concatenating the two lists you have created.

PYTHON TO GO

Basic Python Programming Activity
Solution Python Exercise 5:
The target

ofthis

exercise

istocreate

two lists

called

x_list

and

y_list,which

contain 10 instances of the variables x and y, respectively. You are also
required

to

create

alist

called

big_list,which

contains

the

variables x and y, 10 times each, by concatenating the two lists you have
created.

PYTHON TO GO

Simple Coding: String Formatting
Python uses C-style string formatting to create new, formatted
strings. The "%" operator is used to format a set of variables
enclosed

in

a"tuple"

(a

fixed

size

list),

together

with

a

format

string,

which

contains

normal

text

together

with

"argument specifiers", special symbols like "%s" and "%d”.

%s - String (or any object with a string representation, like
numbers)
%d - Integers
%f - Floating point numbers
%.<number of digits>f - Floating point numbers with a fixed
amount of digits to the right of the dot.
%x/%X - Integers in hex representation (lowercase/uppercase)

Basic Python Programming Activity
PYTHON TO GO

Simple Coding 9: String
Formatting
Let's

say

you

have

a

variable

called

"name"

with

your

user

name

in

it,

and

you

would

then

like

to

print(out a greeting to that user.)

Basic Python Programming Activity

What will be the expected output?

PYTHON TO GO

Simple Coding 10: String Formatting
Let's

say

you

have

a

variable

called

"name"

with

your

user

name

in

it,

and

you

would

then

like

to

print(out a greeting to that user.)
To use two or more argument specifiers, use
a tuple (parentheses):

Basic Python Programming Activity

What will be the expected output?

PYTHON TO GO

Simple Coding 11: String Formatting
Let's say you have a variable called "name" with your user
name

in

it,

and

you

would

then

like

to

print(out

a

greeting to that user.)
Any

object

which

is

not

astring

can

be

formatted

using

the

%s

operator

as

well.

The

string

which

returns

from

the

"repr"

method

of

that

object

is

formatted as the string.

Basic Python Programming Activity

What will be the expected output?

PYTHON TO GO

Basic Python Programming Activity
Python Exercise 6:
You

will

need

to

write

a

format

string

which

prints

out

the data using the following syntax: Hello
Eps Doe. Your current balance is Php53.44.

PYTHON TO GO

Basic Python Programming Activity
Solution

Python

Exercise

6:

You

will

need

to

write

a

format

string

which

prints

out

the

data

using

the

following

syntax:

Hello

Eps

Doe.

Your

current balance is Php53.44.

PYTHON TO GO

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

As you can see, the first thing you learned was printing a
simple sentence. This sentence was stored by Python as a
string.

However,

instead

of

immediately

printing

strings

out,

we

will

explore

the

various

things

you

can

do

to

them. You can also use single quotes to assign a string.
However,

you

will

face

problems

if

the

value

to

be

assigned

itself

contains

single

quotes.

For

example

to

assign the string in these bracket (single quotes are ' ')
you need to use double quotes only like this

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

As you can see, the first thing you learned was printing a
simple sentence. This sentence was stored by Python as a
string.

However,

instead

of

immediately

printing

strings

out,

we

will

explore

the

various

things

you

can

do

to

them. You can also use single quotes to assign a string.
However,

you

will

face

problems

if

the

value

to

be

assigned

itself

contains

single

quotes.

For

example

to

assign the string in these bracket (single quotes are ' ')
you need to use double quotes only like this

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

SUPAH EPS NOTE: That prints out 12, because "Hello world!" is 12 characters
long, including punctuation and spaces. This time I want you to try this
code.

SUPAH

EPS

NOTE:

That

prints

out

4,because

the

location

of

the

first

occurrence of the letter "o" is 4 characters away from the first character.
Notice

how

there

are

actually

two

o's

inthe

phrase

-this

method

only

recognizes the first.

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

SUPAH EPS NOTE: For those of you using silly fonts, that
is a lowercase L, not a number one. This counts the number
of l's in the string. Therefore, it should print 3.

SUPAH EPS NOTE: But why didn't it print out 5? Isn't "o"
the

fifth

character

in

the

string?

To

make

things

more

simple,

Python

(and

most

other

programming

languages)

start things at 0 instead of 1. So the index of "o" is 4.

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

SUPAH EPS NOTE: This prints a slice of the string, starting at index 3, and
ending at index 6. But why 6 and not 7? Again, most programming languages
do this - it makes doing math inside those brackets easier.

If you just have one number in the brackets, it will give you the single
character at that index. If you leave out the first number but keep the
colon, it will give you a slice from the start to the number you left in.
If you leave out the second number, if will give you a slice from the first
number to the end.

You can even put negative numbers inside the brackets. They are an easy way
of starting at the end of the string instead of the beginning. This way, -3
means "3rd character from the end”.

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

SUPAH EPS NOTE: This prints the characters of string from
3to

7skipping

one

character.

This

is

extended

slice

syntax. The general form is [start:stop:step].

SUPAH EPS NOTE:
Note that both of them produce same output
There is no function like strrev in C to reverse a string. But
with

the

above

mentioned

type

of

slice

syntax

you

can

easily

reverse a string like this

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

SUPAH

EPS

NOTE:

The

python

code

will

give

you

a

reversed Hello world! Output.

SUPAH

EPS

NOTE:

These

make

anew

string

with

all

letters

converted

to

uppercase

and

lowercase,

respectively.

Simple Coding 12:
Basic String Operations

Strings are bits of text. They can be defined as anything between
quotes:

PYTHON TO GO

PYTHON Skills Evaluation (Hands-on Activity)

SUPAH

EPS

NOTE:

This

is

used

to

determine

whether

the

string

starts with

something or ends with something, respectively. The

first one will print True, as the string starts with "Hello". The
second one will print False, as the string certainly does not end
with "asdfasdfasdf”.

SUPAH

EPS

NOTE:

This

splits

the

string

into

abunch

of

strings

grouped

together

in

alist.

Since

this

example

splits

at

aspace,

the

first

item

in

the

list

will

be

"Hello", and the second will be "world!”.

PYTHON TO GO

Basic Python Programming Activity
Python

Exercise

7:
Try

to

fix

the

code

to

print

out

the

correct

information

by changing the string.

PYTHON TO GO

Basic Python Programming Activity
Solution Python Exercise 7:
Try

to

fix

the

code

to

print

out

the

correct information by changing the string.

PYTHON TO GO

Basic Python Programming Activity
Output Python Exercise 7:
Try to

fix the code to print out the correct information by
changing the string.