String Functions
String Functions
len(str)
Returns the length (no of characters) of the string.
Example:
>>> A="Corporation" >>> print(len(A))
Output:
11
capitalize( )
Used to capitalize the first character of the string
Example:
>>> city="chennai" >>> print(city.capitalize())
Output:
Chennai
center(width, fillchar)
Returns a string with the original string centered to a total of width columns and filled with fillchar in columns that do not have characters
Example:
>>> str1="Welcome" >>> print(str1.center(15,'*') )
Output:
****Welcome****
find(sub[, start[, end]])
The function is used to search the first occurrence of the sub string in the given string. It returns the index at which the substring starts. It returns -1 if the substring does not occur in the string.
Example:
>>>str1=’mammals’ >>>str1.find(‘ma’)
Output:
0
On omitting the start parameters, the function starts the search from the beginning.
Example:
>>>str1.find(‘ma’,2)Output:
3
Example:
>>>str1.find(‘ma’,2,4)Output:
-1
Displays -1 because the substring could not be found between the index 2 and 4-1.
isalnum( )
Returns True if the string contains only letters and digit. It returns False. If the string contains any special character like _, @, #, *, etc.
Example;
>>>str1=’Save Earth’ >>>str1.isalnum()
Output:
False
The function returns False as space is an alphanumeric character.
Example:
>>>’Save1Earth’.isalnum()Output:
True
isalpha( )
Returns True if the string contains only letters. Otherwise return False.
Example:
>>>’Click123’.isalpha()Output:
False
Example;
>>>’python’.isalpha( )
Output:
True
isdigit( )
Returns True if the string contains only numbers. Otherwise it returns False.
Example:
>>> str1=’Save Earth’ >>>print(str1.isdigit( ))
Output:
False
lower( )
Returns the exact copy of the string with all the letters in lowercase.
Example:
>>>str1=’SAVE EARTH’ >>>print(str1.lower())
Output:
save earth
islower( )
Returns True if the string is in lowercase.
Example:
>>> str1=’welcome’
>>>print (str1.islower( ))
Output:
True
isupper( )
Returns True if the string is in uppercase.
Example:
>>> str1=’welcome’ >>>print (str1.isupper( ))
Output:
False
upper( )
Returns the exact copy of the string with all letters in uppercase.
Example:
>>> str1=’welcome’
>>>print (str.upper( ))
Output:
WELCOME
title( )
Returns a string in title case
Example:
>>> str1='education department' >>> print(str1.title())
Output:
Education Department
swapcase( )
It will change case of every character to its opposite case vice-versa.
Example:
>>> str1="tAmiL NaDu" >>> print(str1.swapcase())
Output:
TaMIl nAdU