First program in Python

First Program

• It is very simple to write and execute any Python Program.
• Python Program can be executed directly in the command line .

print("Hello Python")

Indentation in Python

• C ,C++,Java etc languages use braces to indicate blocks of code for class and function definitions or flow control.
• But Python uses indentation to indicate a block of code.
• We can use at least one space for indentation.

a=5
b=10
if a>b:
    print("a is greter than b")
else:
    print("b is greater than a")

• Python code will raise an error if you skip indentation.

a=5
b=10
if a>b:
#this lin will raise an error
#because no indentation
print("a is greter than b")
else:
    print("b is greater than a")
"""
***Output***
IndentationError: expected an indented block
"""

• You can use number of spaces for indentation but spaces must be same in the same block of code.

a=5
b=10
if a>b:
         print("a is greter than b")
         print("means b is less than a")
else:
         print("b is greater than a")
         print("means a is less than b")
"""
***Output***
b is greater than a
means a is less than b
"""