Built-In String Methods and Functions in Python

capitalize()

This function is used to capitalize the first letter of the string.

Example:

str="hello world"
print(str.capitalize())

Output:

Hello world

count(str, beg, end)

This function is used to count the number of times str occurs in a string. We can specify beg as 0 and end as the length of the message to search the entire string or use any other value to just search a part of the string.

Example:

str="we"
mess="weareweare"
print(mess.count(str,0,len(mess)))

Output:

2

endswith(suffix, beg, end)

This function is used to check if the string ends with a suffix; it returns True if so and False otherwise. We can either set beg=0 and end equal to the length of the message to search the entire string or use any other value to search a part of it.

Example:

str="hello"
mess="helloworldhello"
print(mess.endswith("hello",0,len(mess)))

Output:

True

startswith(prefix, beg, end)

This function is used to check if the string starts with a prefix; it returns True if so and False otherwise. We can either set beg=0 and end equal to the length of the message to search the entire string or use any other value to search a part of it.

Example:

str="hello"
mess="helloworldhello"
print(mess.startswith("hello",0,len(mess)))

Output:

True

lower()

This function is used to convert all characters in the string into lowercase.

Example:

str="WELCOME"
print(str.lower())

Output:

Welcome

upper()

This function is used to convert all characters in the string into uppercase.

Example:

str="welcome"
print(str.upper())

Output:

WELCOME

strip()

This function is used to remove all leading and trailing whitespace in string.

Example:

str="     Happy New Year 2021     "
print(str.strip())

Output:

Happy New Year 2021

lstrip()

This function is used to remove all leading whitespace in the string.

Example:

str="     Apple is Red or Green"
print(str.lstrip())

Output:

Apple is Red or Green

strip()

This function is used to remove all trailing whitespace in the string.

Example:

str="Apple is Red or Green            "
print(str.rstrip())

Output:

Apple is Red or Green

replace(old, new [, max])

This function is used to replace all or max (if given) occurrences of old in a string with new.

Example:

str="Python programming lang"
print(str.replace("lang","language"))

Output:

Python programming language

title()

This function is used as a return string in the title case.

Example:

str="programming language world"
print(str.title())

Output:

Programming Language World

len()

This function is used to return the length of the string.

Example:

str="programming language world"
print(len(str))

Output:

26