Basic Syntax

Python files have .py extension.

Indentation is used in Python to delimit blocks. The number of spaces is variable, but all statements within the same block must be indented the same amount.

The header line for compound statements, such as if, while, def, and class should be terminated with a colon ( : ).

The semicolon ( ; ) is optional at the end of statement, but it is preferred to not using it.

if True:
    print("Answer")
    print("True")
else:
    print("Answer")
  print("False") # Error! Not using same indention.

Printing to the Screen

print("Hello World!")

Reading Keyboard Input

name = input("Enter your name: ")

Comments

# one line comment in python!
"""
Multi line comments in in python,
Is like this!
"""

Python is dynamically typed. You do not need to declare variables!

The declaration happens automatically when you assign a value to a variable.

Variables can change type, simply by assigning them a new value of a different type.

counter = 1000
miles = 1000.0
name = "Abolfazl"
x = None
x = 2
x = "string"

Python allows you to assign a single value to several variables simultaneously, and also allows to assign multiple values to multiple variables too.

a = b = c = 3
x, y, z = 1, 2, "string"