Python string methods

A sequence of characters is known as a string. Python allows you to use single quotes (‘), double quotes (“) or triple quotes (“””) to denote a string.

String methods

Python allows you to perform several string operations using some predefined string functions.

1) len() length

The len() method is used to find the length of a string.

a = "Hello World!"
print(len(a))

# Output
# 12

2) strip() function

The strip() method is used to remove white-space from the beginning and end of a string.

name = "  John Doe "
print(name.strip())

# Output
# John Doe

3) split() method

Python’s split() method function is used to break down the string into an array of smaller strings knows as substrings using a defined separator. If you donot specify a separator, whitespace will be considered as the separator.

Example 1

names = "John, Joe, Janet"
print(names.split(','))
print(names.split())
a="Let's learn python"
print(a.split('learn'))

# Output
# ['John', ' Joe', ' Janet']['John,', 'Joe,', 'Janet']["Let's ", ' python']

Example 2 – Assigning values to separate variables

names = "John, Joe, Janet"
a,b,c = names.split(',')
print(a)
print(b)
print(c)

# Output
# John
# Joe
# Janet

4) capitalize() method

Python capitalize method converts the first letter of the specified string to uppercase and the remaining part of the string to lowercase.

Example

a="python is an interpreted high-level PROGRAMMING LANGUAGE."
b=a.capitalize()
print(b)
c="this is an ExamplE of capitalize function.".capitalize()
print(c)

# Output
# Python is an interpreted high-level programming language
# This is an example of capitalize function

5) upper() method

This method converts the given string to uppercase.

Example

a="python is an interpreted high-level PROGRAMMING LANGUAGE."
print(a.upper())
print("hello World".upper())

# Output
# PYTHON IS AN INTERPRETED HIGH-LEVEL PROGRAMMING LANGUAGE.
# HELLO WORLD

6) lower() method

This method converts the given string to lowercase.

a="Python is an interpreted high-level PROGRAMMING LANGUAGE."
print(a.lower())
print("HELLO world".lower())

# Output
# python is an interpreted high-level programming language.
# hello world

7) replace() method

The replace() method replaces all the occurrence of a substring with another substring. This method takes two parameters:

Substring to replace.
Substring to replace with.

Example

a="PHP is an interpreted high-level programming language."
print(a.replace('PHP','Python'))

# Output
# Python is an interpreted high-level programming language.