Python Lists

List is used to store multiple values in single variable, list value inclosed in square[].A list is structure data in python it is mutable(changeable) or ordered of values.

• store multiple value in single variable.
• list is mutable(changeable).
• collection of ordered elements.
• allow duplicate values.
• list is one in 4 data structure.

Python list

x=["apple", "banana", "guava"]
print(x)

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Output

['apple','banana','guava']

List length

check the length of list and who many items in list.

list length

x=["apple", "banana", "guava"]
print(len(x))

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Output

3

Data type

list data type

Data type - list

x=["apple", "banana", "guava"]
print(type(x))

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Output

<class 'list'>

list creation

Create a list from many ways like array, tuple, string etc.

create a list using tuple

create list using tuple

x=list(1, 2, 3)
print(x)

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Output

[1,2,3]

create a list using strings

create list using string

x="hallo"
y=list(x)
print(y)

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Output

['h', 'a', 'l', 'l', 'o']

Access item (slicing)

Access elements from list using index number

index of frist element is zero(0). python start indexing from zero(0) to N-1

Access item

x=(1, 2, 3,4,5,6,7)
print(x[0])
print(x[-1])
#slicing
print(x[2:5])
#negative slicing
print(x[-7:-2])

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Output

[1]
[7]
[3, 4, 5]
[1, 2, 3, 4, 5]

Python arrays

• Tuple:tuple is written in Parentheses (), collection of immutable and ordered values. allow duplicate.
• List:tuple is written in square brackets [], collection of mutavle and ordered values. allow duplicate.
• Dict:tuple is written in curly brackets {}, collection of unordered and mutable values. not allow duplicate.
• Set:tuple is written in curly brackets {}, collection of unordered , unindexed and immutable values. not allow duplicate.