I wanted to eliminate specific characters by using rstrip() function in python, but it didn't work well to me.

Here is the code I wrote.

a = "happy! New! Year!!!"
print(a)
b = a.lower()
print(b)
c = b.rstrip('!')
print(c)

And this is the result.

happy! New! Year!!!
happy! new! year!!!
happy! new! year

The result I wanted was to output "happy new year", but the function just got rid of last three '!'. I have no idea why it happened.

CodePudding user response：

the rstrip function in python will only remove trailing characters that are specified, not all instances of the character in the string. For example if I did:

a = 'hello'

print(a.rstrip('l'))

nothing would change, because there is an e at the end of the string after any instance of 'l'

You might want to try using the replace method:

a = 'hello'

print(a.replace('l','')
> heo

CodePudding user response：

The rstrip function only strips a given character appearing one or more times at the end of the entire string. To remove ! from the end of each word, we can use re.sub:

a = "happy! New! Year!!!"
output = re.sub(r'\b! (?!\S)', '', a)
print(output)  # happy New Year