Advanced list processing - Python

Advanced list processing:

List Comprehension:

^v       List comprehensions provide a concise way to apply operations on a list.

^v       It creates a new list in which each element is the result of applying a given operation in a list.

^v       It consists of brackets containing an expression followed by a “for” clause, then a list.

^v       The list comprehension always returns a result list.

Syntax

list=[ expression for item in list if conditional ]

Nested list:

List inside another list is called nested list.

Example:

>>> a=[56,34,5,[34,57]]

>>> a[0]

56

>>> a[3]

[34, 57]

>>> a[3][0]

34

>>> a[3][1]

57