The strip() removes whitespace from the beginning or the end:


 a = " Hello, World! "

print(a.strip()) # returns "Hello, World!"


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lower()/upper()  returns the string in lower/upper case:

a = "Hello, World!"
print(a.lower())
print(a.upper())

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split() divides the string into substrings if it finds instances of the separator:
it is case sensitive, returns list,removes the word given in () from string.


a = "Hello, World!"
b = a.split("W")
print(b)

output =>

['Hello, ', 'orld!']


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To check if a certain phrase or character is present in a string, we can use the keywords in or not in.