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Basics Chapter 12 – String Slicing & Operations on String

Basics of string slicing & operations on string

EXIA

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EXIA

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Length of a String

We can find the length of a string using len() function.

Example:

fruit = "Mango"
len1 = len(fruit)
print("Mango is a", len1, "letter word.")

Output:

Mango is a 5 letter word.

String as an array

A string is essentially a sequence of characters also called an array. Thus we can access the elements of this array.

Example:

pie = "ApplePie"
print(pie[:5])
print(pie[6])	#returns character at specified index

Output:

Apple
i

Note: This method of specifying the start and end index to specify a part of a string is called slicing.

Slicing Example:

pie = "ApplePie"
print(pie[:5]) #Slicing from Start
print(pie[5:]) #Slicing till End
print(pie[2:6]) #Slicing in between
print(pie[-8:]) #Slicing using negative index

Output:

Apple
Pie
pleP
ApplePie

Loop through a String:

Strings are arrays and arrays are iterable. Thus we can loop through strings.

Example:

alphabets = "ABCDE"
for i in alphabets:
print(i)

Output:

A 
B
C
D
E

Main Example

fruit = "Mango"
mangoLen = len(fruit)
print(mangoLen)
print(fruit[0:4]) # including 0 but not 4
print(fruit[1:4]) # including 1 but not 4
print(fruit[:5])
print(fruit[0:-3])
print(fruit[:len(fruit)-3])
print(fruit[-1:len(fruit) - 3])
print(fruit[-3:-1])

# Quick Quiz:
nm = "Harry"
print(nm[-4:-2])

# Output
5
Mang
ang
Mango
Ma
Ma

ng
ar

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