How to fix Python IndentationError: unexpected indent

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Python IndentationError: unexpected indent
Indentation refers to the spaces at the beginning of a code line.
Where in other programming languages the indentation in code is for readability only,
the indentation in Python is very important. Python uses indentation to indicate a block of code.
Python treats the statements that have the same indentation level (statements that have equal no
of whitespaces before them) as a single block of code. So whereas in languages like c, c++, etc.
a block of code is represented by Curly braces { }, in python, a block is a group of statements
that have the same Indentation level i.e same number of leading whitespaces

Causes of Indentation error
1. Python will throw an indentation error if you skip the Indentation. For Example,
the below code would throw IndentationError: expected an indented block error:

2. The number of whitespaces in indented code should be the same for the same
block of code. Otherwise, Python will throw IndentationError: unexpected indent

3. Indentation on the first line of code is not allowed.
Python will throw IndentationError: unexpected indent.

4. intermixing of tabs and whitespaces in indentation can cause wrong indentation errors

Python best practice for indentation

1. Python uses 4 spaces as default indentation spaces.
2. The first line of python code cannot have Indentation.
3. Indentation is mandatory in python to define the blocks of statements.
4. The number of spaces must be uniform in a block of code.
5. It is preferred to use whitespaces instead of tabs to indent in python.
6. Do not intermix tabs and whitespace

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