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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.


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



Accessing Lists

To access list following syntax is used:

<list name>[index]


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

print list1[2]




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


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


  • Replicate Lists

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


print L1*2


[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]


[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


[0, 2, 3, 4]


  • Deletion

To delete value from list del is used.

L1 = [1, 2, 3, 4]

del L1[0]

print L1


[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.sortSort 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

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