String Functions And Methods In Python Programing

Functions which perform manipulation on strings. 

string.capitalize() 

Returns copy of the string with the first character capitalized. 

Examples of string.capitalize() in interactive mode: 

'ahoy123'.capitalize()  Out[1]: 'Ahoy123'  'wow'.capitalize()  Out[2]: 'Wow'  ''.capitalize()  Out[3]: ''  ' '.capitalize()  Out[4]: ' '  '..'.capitalize()  Out[5]: '..'

string.isalnum() 

Returns True if the characters in the string are alphanumeric (alphabets or numbers), otherwise False.

Examples of string.isalnum() in interactive mode: 

"12345".isalnum()  Out[1]: True  "abc".isalnum()  Out[2]: True  "abc123".isalnum()  Out[3]: True  " ".isalnum()  Out[4]: False  "//".isalnum()  Out[5]: False  ''.isalnum()  Out[6]: False

string.isalpha() 

Returns True if all the characters in the string are alphabetic, otherwise False.

Examples of string.isalpha() in interactive mode: 

'abc'.isalpha()  Out[1]: True  'abc123'.isalpha()  Out[2]: False  '//'.isalpha()  Out[3]: False  ''.isalpha()  Out[4]: False

string.isdigit() 

Returns True if all the characters in the string are digits, otherwise False.

Examples of string.isdigit() in interactive mode:  

'1234'.isdigit()  Out[1]: True  'abc'.isdigit()  Out[2]: False  'abc123'.isdigit()  Out[3]: False  ''.isdigit()  Out[4]: False  ' 1234 '.isdigit()  Out[5]: False

string.islower() 

Returns True if all the cased characters in the string are lowercase, otherwise False.

Examples of string.islower() in interactive mode:

'abc'.islower()  Out[1]: True  'abc123'.islower()  Out[2]: True  '123a34/+'.islower()  Out[3]: True  'Abc'.islower()  Out[4]: False  ''.islower()  Out[5]: False

string.isspace() 

Returns True if there are only whitespace characters in the string, otherwise False. 

Examples of string.isspace() in interactive mode: 

' '.isspace()  Out[1]: True  ''.isspace()  Out[2]: False  'abc def'.isspace()  Out[3]: False

string.isupper() 

Returns True if all the cased characters in the string are uppercase, otherwise False. 

Examples of string.isupper() in interactive mode: 

'ABC'.isupper()  Out[1]: True  'ABC123'.isupper()  Out[2]: True  'ABC1D'.isupper()  Out[3]: True  'ABC1d'.isupper()  Out[4]: False

string.lower() 

Returns a copy of the string with all the cased characters converted to lowercase.

Examples of string.lower() in interactive mode: 

‘ABC’.lower()  Out[1]: 'abc'  'ABC123'.lower() Out[2]: 'abc123'  'ABC1d'.lower()  Out[3]: 'abc1d'  ''.lower()  Out[4]: ''  ' abCDEFG//#4'.lower()  Out[5]: ' abcdefg//#4'

string.upper() 

Returns a copy of the string with all the cased characters converted to uppercase. 

Examples of string.upper() in interactive mode: 

'abc'.upper()  Out[51]: 'ABC'  'abcDEghi'.upper()  Out[52]: 'ABCDEGHI'  '1234'.upper()  Out[53]: '1234'  'abc123'.upper()  Out[55]: 'ABC123'  '123 + 369'.upper()  Out[56]: '123 + 369'

string.find(sub[,start[,end]]) 

Returns the lowest index of the string where the substring sub is found within the slice range of start and end. Returns -1 if sub is not found. 

Examples of string.find(sub[,start[,end]]) in interactive mode:

'amazing'.find('in')  Out[57]: 4  'amazing'.find('a')  Out[58]: 0  'hilarious'.find('i')  Out[59]: 1  'amazing'.find('a',1,4)  Out[61]: 2  'hilarious'.find('io',2,6)  Out[65]: -1  'hilarious'.find('io',2,8) Out[66]: 5  'hilarious'.find('io',2)  Out[67]: 5