Sequence in Python

Sequence is any ordered set in python like List, Tuple, String

• List: List is mutable and can store any type of object.
• Tuple: Tuple is immutable and can store any type of object.
• String: String is sequence which can store only characters e.g. “Gaurav” has characters ‘G’, ‘a’, ‘u’, ‘r’, ‘a’, ‘v’.

indexing of sequence

Common operations in sequence:

1. Fetch element using index: mySequence[index] will return element at given index. index is zero based.

str1 = "Gaurav"
print(str1[2]) #output is "u"
list1 = [1, 2, "Gaurav", 38.5, 'v']
print(list1[-1]) #-1 represents the last element. output is 'v'
print(list[-3]) #output is "Gaurav"

2. + : combines two sequences of same data type e.g. [1, 2] + [3, 4] = [1, 2, 3, 4]

str1 = "Gaurav " + "Verma"
print(str1) #output is " Gaurav Verma"

tuple1 = (1, 2, 3) + (4, 5, 6)
print(tuple1) #output is (1, 2, 3, 4, 5, 6)

list1 = [1, 2, 3] + ["4", "5"]
print(list1) #output is [1, 2, 3, "4", "5"}

2. * : repeats the sequence. e.g. 3*”Gaurav” = “GauravGauravGaurav” or
[1, 2]*3 = [1, 2, 1, 2, 1, 2]

str1 = 3*" Gaurav"
print(str1) #output is " Gaurav Gaurav Gaurav"

str2 = "Gaurav "*3
print(str2) #output is "Gaurav Gaurav Gaurav "

tuple1 = (1, 2, 3)*3 #can…