List Data Type in Python

Concept

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List is a collection which is mutable, ordered and changeable. Allows duplicate members.

List are just like the arrays, declared in other languages. List can contain int, float, str, list, dict, set any data type.

Code Example

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Example 1:

# empty list
>>> l = []
[]

Example 2:

>>> l = [10, 20.35, 'Hello']
[10, 20.35, 'Hello']

Example 3:

>>> l = [10, 20.35, 'Hello']
>>> len(l)
3

>>> l [1]
20.35

# append

>>> l.append("New")
[10, 20.35, 'Hello', 'New']

>> l [1: 3]
[20.35, 'Hello']

>>> l [-3, -1]
20.35, 'Hello']

>>> l [0] = 40
>>> l
[40, 20.35, 'Hello', 'New']

# reverse

>>> l.reverse()
>>> l
['New', 'Hello', 20.35, 40]

# extend

>>> l = ['New', 'Hello', 20.35, 10]
>>> l1 = ['a', 'b']
>>> l.extend(l1)
>>> l
['New', 'Hello', 20.35, 10, 'a', 'b']

# pop()

>>> l = ['New', 'Hello', 20.35, 10]
>>> l.pop()
10

# sort

>>> l = [5, 2, 1, 3, 4]
>>> l.sort()
>>> l
[1, 2, 3, 4, 5]

# copy

>>> l = [1, 2, 3, 4, 5]
>>> l1 = l.copy()
>>> l1
[1, 2, 3, 4, 5]

# Data with List

t = (1, 2)
d = {1: 'A', 2: 'B'}
l1 = [1, 2]
s = {1, 2}

l = [10, t, d, l1, s, 20]

Output: 
 [10, (1, 2), {1: 'A', 2: 'B'}, [1, 2], {1, 2}, 20]

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