string functions in python 3 with examples

1. capitalize() method in Python 3

capitalize() function in Python makes first character of string capital.

Example

>>> name='lovejot'
>>> name.capitalize()
'Lovejot'

 2. find()  method in Python 3

find() method  in Python is used to find first index position of substring in a string value. It returns-1 if substring is not found.

Syntax:

String.find (Substr[,Start[,End]])

Substr refers to substring we want to find in String.

Start refers to starting index.

End refers to ending index of range in which we have to find substring.

 Example

>>> name='lovejot'
>>> name.find('o')
1

>>> name.find('o',2,7)
5

3. isalnum() method in Python 3

isalnum() method  in Python return True if string contains alphabets or digits. There must be at least one character in String.

Example

>>> name='lovejot'
>>> name.isalnum()
True

>>> name1='lovejot2019'
>>> name1.isalnum()
True

4. isalpha() method in Python 3

isalpha() method in Python return True if string contains alphabets only. There must be at least one character in String.

Example

>>> name='lovejot'
>>> name.isalpha()
True

>>> name1='lovejot2019'
>>> name1.isalpha()
False

5. isdigit() method in Python 3

isdigit() method  in Python return True if string contains digits only. There must be at least one character in String.

Example

>>> name='123'
>>> name.isdigit()
True

>>> name1='lovejot2019'
>>> name1.isdigit()
False

6. islower() method in Python 3

islower() method in Python return True if string contains lower case alphabets only. There must be at least one character in String.

Example

>>> name='lovejot'
>>> name.islower()
True

>>> name1='Lovejot'
>>> name1.islower()
False

7. isupper() method in Python 3

isupper() method in Python return True if string contains upper case alphabets only. There must be at least one character in String.

Example

>>> name='LOVEJOT'
>>> name.isupper()
True

>>> name1='Lovejot'
>>> name1.isupper()
False

8. isspace() method in Python 3

isspace() method in Python return True if string contains space only. There must be at least one character in String.

Example

>>> name=' '
>>> name.isspace()
True

>>> name1=” “
>>> name1.isspace()
True

9. lower() method in Python 3

lower()  method in Python converts string value into lowercase. There must be at least one character in String.

Example

>>> name='LOVEJOT '
>>> name.lower()
'lovejot'

>>> name1=”LOVEJOT2019“
>>> name1.lower()
'lovejot2019'

 10. upper() method in Python 3

upper() method of Python converts string value into capital letters. There must be at least one character in String.

Example

>>> name='lovejot '
>>> name.upper()
'LOVEJOT'

>>> name1=”lovejot2019“
>>> name1.upper()
'LOVEJOT2019'

 11. lstrip() method in Python 3

lstrip()  method in Python removes spaces or specified character from the beginning of a string. There must be at least one character in String.

Syntax:

String. lstrip  ([ Char])

Char refers to the character that needs to be removed from the beginning of a String. All consecutive occurrences of character will be removed.

Example

>>> name='   lovejot   ';
>>> name.lstrip()
'lovejot   '

>>> name1='**lovejot**'
>>> name1.lstrip('*')
'lovejot**'

12. rstrip() method in Python 3

rstrip() method in Python removes spaces or specified character from the end of a string. There must be at least one character in String.

Syntax:

String. rstrip  ([ Char])

Char refers to the character that needs to be removed from the end of a String. All consecutive occurrences of character will be removed.

Example

>>> name='   lovejot   ';
>>> name.rstrip()
'  lovejot'

>>> name1='**lovejot**'
>>> name1.rstrip('*')
'**lovejot'

13. strip() method in Python 3

strip() method in Python removes spaces or specified character from both the ends of a string. There must be at least one character in String.

Syntax:

String. strip  ([ Char])

Char refers to the character that needs to be removed from the beginning and end of a String. All consecutive occurrences of character will be removed.

Example

>>> name='   lovejot   ';
>>> name.strip()
'lovejot'

>>> name1='**lovejot**'
>>> name1.strip('*')
'lovejot*'