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Python Lists

 

Lists are Python’s most flexible ordered collection object type. A list can be created by putting the value inside the square bracket and values are separated by comma.

<list name>=[value1,value2,...,value n];

Unlike strings, lists can contain any sort of object: numbers, strings, even other lists. Python lists are:

  • Ordered collections of arbitrary objects
  • Accessed by offset
  • Arrays of object references
  • Variable length, heterogeneous, arbitrarily nestable
  • Of the category mutable sequence
  • The elements are stored in the index basis with starting index as 0.
  • A python list is enclosed between square([]) brackets.

e.g.

list1 = [1,2,3,4,5];

list2=["hello","intellipaat"];

 

Accessing Lists

To access list following syntax is used:

<list name>[index]

e.g.

list1 = [1,2,3,4,5];

print list1[2]

Output 

3

 

Operations on List

On list following operation are performed:

  • Concatenate List

+ Operator is used to concatenate two lists.

L1 = [1, 2, 3, 4]

L2 = [5, 6, 7, 8]

print L1+L2

Output

[1, 2, 3, 4, 5, 6, 7, 8]

 

  • Replicate Lists

Operator * is used to repeat a list by specific number of time.

L1=[1,2]

print L1*2

Output

[1,2, 1, 2]

 

  • Sub List

It is used to obtain a sub list which is done by specifying the index.

L1 = [1,2,3,4]

print L1[0:3]

Output

[1, 2, 3]

 

  • Update List

For this purpose assign the value to the index of the list.

L1 = [1, 2, 3, 4]

L1[0] = 0

print L1

Output

[0, 2, 3, 4]

 

  • Deletion

To delete value from list del is used.

L1 = [1, 2, 3, 4]

del L1[0]

print L1

Output

[2, 3, 4]

 

Functions and Methods in List

min(list_name) Returns the minimum value from the list
max(list_name) Returns the largest value from the list.
len(list_name) Returns number of elements in a list.
cmp(list1,list2) Compares the two lists.
list.reverse() Reverse the list
list.sort Sort the list
list(sequence) Covert the sequence into the list
list.append(value) Add the value into the list
list.remove(value) Remove the value from the list

"0 Responses on Python Lists"

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