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string functions in python 3 with examples

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1. capitalize() function in Python 3

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

Example

>>> name=’lovejot’

>>> name.capitalize()
‘Lovejot’

#First character becomes capital




 2. find() function 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

#Index of first occurance of ‘o’ is shown i.e. 1.

>>> name.find(‘o’,2,7)
5

#Index of ‘o’ in index range 2,7 is shown i.e. 5.

3. isalnum() function 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() function 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() function 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

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6. islower() function 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

#First character is capital in ‘Lovejot’.

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

#Only first character is Capital



8. isspace() function 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() function 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() function 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() function 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   ‘

#Spaces removed from the beginning

>>> name1=’**lovejot**’

>>> name1.lstrip(‘*’)
‘lovejot**’

#*s removed from the beginning.



12. rstrip() function 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’

#Spaces removed from the end.

>>> name1=’**lovejot**’

>>> name1.rstrip(‘*’)
‘**lovejot’

#*s removed from the end.

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