Python Sequence Types

PythonProgrammingServer Side Programming

Some basic sequence type classes in python are, list, tuple, range. There are some additional sequence type objects, these are binary data and text string.

Some common operations for the sequence type object can work on both mutable and immutable sequences. Some of the operations are as follows −

Sr.No. Operation/Functions & Description
1

x in seq

True, when x is found in the sequence seq, otherwise False

2

x not in seq

False, when x is found in the sequence seq, otherwise True

3

x + y

Concatenate two sequences x and y

4

x * n or n * x

Add sequence x with itself n times

5

seq[i]

ith item of the sequence.

6

seq[i:j]

Slice sequence from index i to j

7

seq[i:j:k]

Slice sequence from index i to j with step k

8

len(seq)

Length or number of elements in the sequence

9

min(seq)

Minimum element in the sequence

10

max(seq)

Maximum element in the sequence

11

seq.index(x[, i[, j]])

Index of the first occurrence of x (in the index range i and j)

12

seq.count(x)

Count total number of elements in the sequence

13

seq.append(x)

Add x at the end of the sequence

14

seq.clear()

Clear the contents of the sequence

15

seq.insert(i, x)

Insert x at the position i

16

seq.pop([i])

Return the item at position i, and also remove it from sequence. Default is last element.

17

seq.remove(x)

Remove first occurrence of item x

18

seq.reverse()

Reverse the list

Example Code

Live Demo

myList1 = [10, 20, 30, 40, 50]
myList2 = [56, 42, 79, 42, 85, 96, 23]

if 30 in myList1:
   print('30 is present')
    
if 120 not in myList1:
   print('120 is not present')
    
print(myList1 + myList2) #Concatinate lists
print(myList1 * 3) #Add myList1 three times with itself
print(max(myList2))
print(myList2.count(42)) #42 has two times in the list

print(myList2[2:7])
print(myList2[2:7:2])

myList1.append(60)
print(myList1)

myList2.insert(5, 17)
print(myList2)

myList2.pop(3)
print(myList2)
myList1.reverse()
print(myList1)

myList1.clear()
print(myList1)

Output

30 is present
120 is not present
[10, 20, 30, 40, 50, 56, 42, 79, 42, 85, 96, 23]
[10, 20, 30, 40, 50, 10, 20, 30, 40, 50, 10, 20, 30, 40, 50]
96
2
[79, 42, 85, 96, 23]
[79, 85, 23]
[10, 20, 30, 40, 50, 60]
[56, 42, 79, 42, 85, 17, 96, 23]
[56, 42, 79, 85, 17, 96, 23]
[60, 50, 40, 30, 20, 10]
[]
raja
Published on 30-Oct-2018 12:23:10
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