3)Python Statement, Indentation ,Comments and DocString

Python Statement, Indentation ,Comments and DocString

Python Statements:
Instructions that a Python interpreter can execute are called statements.

Example:

a=10
if statement, for statement, while statement etc.

Two types of Python Statements:

1. Single line statement
2. Multi-line statement,

1.Single line statement:
Instructions are end with in a line

Example:

a=10

2.Multi-line statement:
Multi-line statement extend over multiple lines with the line continuation character (\).

Two types of continuations:

Explicit continuation ==> using \ character
Implicit continuation ==> using brackets [] or braces {} 

Example:

Note:
We can also put multiple statements in a single line using semicolons,

Example:

a=20; b=10; c=30

Python Indentation:

Most of the programming languages like C, C++, Java use braces { } to define a block of code. But Python uses indentation 

Note:
A code block (body of a function, loop etc.) starts with indentation and ends with the first unindented line.

Indetation ==> Whitespaces , prefered is tabs, we can use any amount of space, but should be consistent

Incorrect indentation will result into IndentationError

Python Comments:

Comments are very important while writing a program.

Note:

• It describes what's going on inside a program so that a person looking at the source code does not have a hard time figuring it out
• Basically, helpful to give the program logic for understandability

Hash (#) symbol to start writing a comment.

Two types of comments:

1. Single line comments ==> using #
2. Multi-line comments ==> using either ''' ''' or """ """

Docstring in Python:

Docstring is short for documentation string.

Note:

It is a string that occurs as the first statement in a module, function, class, or method definition. We must write what a function/class does in the docstring.

Syntax:

Within tuples quotes

""" """ 

Docstring is available to us as the attribute __doc__ of the function.

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