Basic Python Review Lesson

Python Basics Review

Printing, Variables, Type Conversion, Input Function, Concatenation

Displays any output to the console; can be math calculations and/or strings including text and number characters.

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​Print Function

Multiple Choice

What is the correct way to print "Hello, World!" in Python?

• echo "Hello, World!"

• print("Hello, World!")

• System.out.print("Hello, World!")

• printf("Hello, World!")

Multiple Choice

What will print(5 + 3) output?

• 5 + 3

• 8

• Error

• Nothing.

Printing variables

When printing a variable, no quatation marks are used; Otherwise, it will print the variable name itself as a string.

age = 12
print(age)
Console will print 12.

​name = "Adam"
print("name")

The computer will print name, NOT Adam

Like a closet or storage box that you name and save data to be used later.

Variables

A variable that typically saves text, spaces, and characters. Can include numbers; Will always be surrounded by QUOTATION MARKS

​​Strings

​Positive and negative whole numbers including zero; Used for math calculations.

number_of_students = 12

​​Integers

​Positive and negative decimal numbers; Used for math calculations as well.

gas_price = 3.29

​​Floats

Multiple Choice

Which of the following is a correct variable assignment for a string?

• name = "John"

• name = 100

• name = 10.5

• name = True

Multiple Choice

What data type is the variable age = 16?

• String

• Integer

• Float

• Boolean

Multiple Choice

Which of the following is a float in Python?

• x = 10

• x = "10"

• x = 10.0

• x = True

Converts whatever is enclosed in the ( ) to a string.

str(10) => "10"

str ( ) function

​Converts whatever is enclosed in the ( ) to an integer; If it's a decimal, it will round down.

int(3.5) => 3
int("3") = > 3

​​int ( ) function

Converts whatever is enclosed in the ( ) to a decimal;

float (3) => 3.0

​​float ( )

Multiple Choice

How do you convert a string, num = "123" to an integer in Python?

• int(num)

• str(num)

• float(num)

• bool(num)

Multiple Choice

What is the output of print(float(7))

• 7

• 7.0

• Error

• "7"

The Input Function or input ( )

A way to get someone to interact with the computer program and enter information that is saved to a variable.

name = input ("Hello, what is your name?" )

Your prompt goes in QUOTATIONS; so all data will be a string by default.

Multiple Choice

Which is the correct way to take input from the user in Python?

• input( )

• print ( )

• raw_input( )

• scanf( )

Type Conversion and input

This will convert the entered data from a string to a float (decimal).

​float(int("prompt: "))

This will convert the entered data from a string to an integer.

​int(input("prompt))

Multiple Choice

What will be the data type of the value returned by input() by default?

• Integer

• Float

• String

• Boolean

Concatenation (Adding Strings and variables)

We can use the addition (+) operator to combine multiple strings and/or variables into one.

print(first_name + middle_name + last_name)
print("I am " + str(age) + " years old.")

Multiple Choice

What is the result of the following code? print("Hello " + "World!")

• HelloWorld!

• Hello World!

• Error

• Hello
  World!

Multiple Choice

Which of the following will combine a number and a string correctly?

• print("Age: " + 25)

• print("Age: " + str(25))

• print("Age: " + float(25))

• print("Age: " + 25.0)