Python_Lesson 2

PYTHON OPERATORS

• Lesson 2

​Programming Languages

• ​Programs are written in languages called programming languages.

• ​Humans can understand high-level languages such as Python, C# and Java.

• ​Computers can understand low-level languages such as Assembly Language and Machine Code.

​Compilers & Interpreters

• Translate programs from high-level to low-level languages.

• ​Interpreters translate code line by line.

• ​Interpreters are used each time the code is run.

• ​Compilers translate code all at once and make an executable file.

Python

• Python is a powerful high level language

• It is an Object Oriented Programming Language

• It was developed by Guido Van Rossum

print("Hello world")

world =
print("Hello", world)

Python Operators

Operators are special symbols, or combinations of symbols, that designate some type of computation.

+ - * /

These are the basic mathematical operators.

In Python you can use maths operators to do sums:

+	add
-	subtract
*	multiply
/	divide
**	to the power

Create a calculation

print(230 5782 * 2 / 23781)

Match

Match the following

• /

• *

• +

• =

• -

divided by

multiplied by

add

assigns a value

substract

• divided by

• multiplied by

• add

• assigns a value

• substract

print()

Don't forget: we can use the print() command to display an output.
e.g. print(14-2)
would show 12 as an output

Concatenating

If we want to output several things at once, we can separate them with commas:
e.g. print("There are ", 3, " left")
would output: There are 3 left

=

= does not work as a mathematical operator. Instead, = is used to assign a value to a variable.
e.g. name = "John Smith"

=

However, we can use = to assign a value to a variable that is the result of a calculation.
e.g. result = 3 + 5
print(result)
This will output the value 8.

==

This operator will check if two pieces of data are equal. If they are, it will return a value of true.
e.g. 2==2 will return a value of true
2==5 will return a value of false

Try the following statements in python window or make use of online link and give output:

• print ("Welcome")

• print (4+5+7)

• print (89-5+7*4)

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