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String Methods in Python Programming

String in Python

In this lesson, we will learn about the different types of string methods in Python programming and their uses with the help of examples.

What are String Methods in Python

String methods in Python are a collection of useful functions applied on a string to solve various string related questions. Let's see all the important string methods one by one with examples.

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find() Method

The find() method returns the index of the first occurrence of the specified character or string within the current string. The find() method accepts two arguments.

The first argument is the string or character and the second optional argument is the index from where we want to check the occurrence. If the index is not given, it will start checking the occurrence from index 0.

If search string or character is not found in the current string then the find() method will return -1.

Example

str='I am a boy and I love java programming'

if str.find('I')>=0:
    print("Found at postion", str.find('I'))
else:
    print("Not found")

if str.find('I',5)>=0:
    print("Found at postion", str.find('I',5))
else:
    print("Not found")

Output

Found at postion 0
Found at postion 15

rfind() Method

The rfind() method returns the index of the last occurrence of the specified character or string within the current string.

Example

str='I am a boy and I love java programming'
if str.rfind('a')>=0:
    print("Last found at postion", str.rfind('a'))
else:
    print("Not found")

Output

Last found at index 32

count() Method

The count() method returns the number of times a specified character or string occurs within the current string.

The count() method accepts three arguments. The first argument is the character or string we are counting for, and the optional second and third arguments are the start and end range to count within.

Example

str='hello world, hello python, hello programming, hello coding'

print(str.count('hello'))
print(str.count('hello',12))
print(str.count('hello',12,45))

Output

4
3
2

startswith() Method

The startswith() method returns True if the current string starts with the specified string, otherwise, it returns False.

The startswith() method accepts three arguments. The first argument is the character or string we are checking for, and the optional second and third arguments are the start and end range to check within.

Example

str='hello world, hello python, hello programming, hello coding'

print(str.startswith('hello'))
print(str.startswith('hello',13))
print(str.startswith('hello',19,45))

Output

True
True
False

endswith() Method

The endswith() method returns True if the current string ends with the specified string, otherwise, it returns False.

The endswith() method accepts three arguments. The first argument is the character or string we are checking for, and the optional second and third arguments are the start and end range to check within.

Example

str='hello world, hello python, hello programming, hello coding'

print(str.endswith('coding'))
print(str.endswith('programming',24))
print(str.endswith('python',6,25))

Output

True
False
True

isalnum() Method

The isalnum() method returns True if the string is an alphanumeric (contains only alphabets and numbers), otherwise, it returns False. The string should not contain any space or other special character.

Example

str1='section2b'
str2='section 2b'

print(str1.isalnum())
print(str2.isalnum())

Output

True
False

isalpha() Method

The isalpha() method returns True if all characters in the string are alphabets, otherwise, it returns False.

Example

str1='sectionb'
str2='section-b'

print(str1.isalpha())
print(str2.isalpha())

Output

True
False

isdigit() Method

The isdigit() method returns True if all characters in the string are digits, otherwise, it returns False.

Example

str1='2586'
str2='2586a'

print(str1.isdigit())
print(str2.isdigit())

Output

True
False

islower() Method

The islower() method returns True if all alphabets in the string are lowercase letter, otherwise, it returns False.

Example

str1='apple ball'
str2='2-apple 1-ball'

print(str1.islower())
print(str2.islower())

Output

True
True

isupper() Method

The isupper() method returns True if all alphabets in the string are uppercase letter, otherwise, it returns False.

Example

str1='APPLE BALL'
str2='2-APPLE 1-BALL'

print(str1.isupper())
print(str2.isupper())

Output

True
True

lower() Method

The lower() method returns a new string after converting all the characters of the string in lowercase.

Example

str='PYTHON'
print(str.lower())

Output

python

upper() Method

The upper() method returns a new string after converting all the characters of the string in uppercase.

Example

str='python'
print(str.upper())

Output

PYTHON

replace() Method

The replace() method returns a new string after replacing all the occurrences of a specified character or string with the other specified character or string. The replace() methods accepts three arguments.

The first argument is the old value, the second argument is the new value and the optional third argument is the number of times to replace the old value with the new value.

Example

str='My dog name is max. My dog loves to eat meat every day.'
print(str.replace('a','p'))
print(str.replace('dog','cat'))
print(str.replace('a','p',2))

Output

My dog npme is mpx. My dog loves to ept mept every dpy.
My cat name is max. My cat loves to eat meat every day.
My dog npme is mpx. My dog loves to eat meat every day.

strip() Method

The strip() method returns a new string after removing all the whitespaces from beginning and end of the string. The strip() methods accepts one optional argument.

The optional argument is a set of characters to remove as leading or trailing characters.

Example

str1='      Hello World     '
str2='********Hello World********'

print(str1.strip())
print(str2.strip('*'))

Output

Hello World
Hello World

split() Method

The strip() method returns a list after splitting the string at the specified separator. The default separator is any whitespace character.

Example

str1='Hello    how  are you'
str2='apple-banana-orange-cherries'

print(str1.split())
print(str2.split('-'))

Output

['Hello', 'how', 'are', 'you']
['apple', 'banana', 'orange', 'cherries']

capitalize() Method

The capitalize() method returns a new string after converting the first letter of the string in uppercase.

Example

str1='hello how are you'
str2='14 years old boy'

print(str1.capitalize())
print(str2.capitalize())

Output

Hello how are you
14 years old boy

title() Method

The title() method returns a new string after converting the first letter of each word of the string in uppercase.

Example

str1='hello how are you'
str2='14 years old boy'

print(str1.title())
print(str2.title())

Output

Hello How Are You
14 Years Old Boy

swapcase() Method

The swapcase() method returns a new string after converting the uppercase letter into lowercase and vice versa.

Example

str='heLLo HoW ARe yOu'
print(str.swapcase())

Output

HEllO hOw arE YoU

Test Your Knowledge

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