Building blocks of Python: Indentation and statement

4. Indentations

Unlike other programming languages, Python uses indentations to define a block of code
A code block (body of a function, loop etc) starts with indentation and ends with the first unindented line.
The amount of indentation is up to the user, but it must be consistent
Generally four whitespaces are used for indentation and is preferred over tabs
Leading whitespaces (spaces and tabs) at the beginning of a logical line is used to compute the indentation level of the line, which in turn is used to determine the grouping of statements.
Indentation is a good way to keep the code readable

5. Python Statement

Instructions that a Python interpreter can execute are called statements.
For example, a = 1 is an assignment statement.
if statement, for statement, while statement etc. are other kinds of statements which will be discussed later.

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