1.14 Input operation Comments Indentation

Input operation:

Input operation is used for taking input from command line/prompt that is from user.

username = input(‘Enter user name:’)

print(username)

Comments:

In Python comments are followed by ‘#’ sign.

Reserved words

A keyword is an identifier that has predefined meaning in a programming language and therefore cannot be used as a “regular” identifier. Doing so will result in a syntax error.

Indentation

indentation is four spaces.

Don't use tabs, don't mix them with spaces. Use four spaces, not two, not three, not five. Just use four.

To indicate a block of code in Python, you must indent each line of the block by the same amount. The two blocks of code in our example if-statement are both indented four spaces, which is a typical amount of indentation for Python

order_total = 247 # GBP

# classic if/else form

if order_total > 100:

    discount = 25 # GBP

else:

    discount = 0 # GBP

print(order_total, discount)