[SOLVED] String Subtraction in Python

Question

Are there any functions to remove part of a string in Python i.e. to remove a certain phrase from the inputted string.

Answer 1

You can for example use the replace method for that.

'world'.replace('l', '')

replaces l again nothing, so you get a new string 'word'.

Beware - if there are more ls, all will be changed. ;)

You can also use slicing to create a new string.

x = 'abracadabra'
print(x[:4]+x[-3:])

This leads to 'abrabra'.

Slices are convenient, we have a mini tutorial about it here in the learn section.

Answer 2

Sami, by using replace() with strings you create a new string. You can check it with id() function:

>>> txt = 'hello'
>>> txt => 'hello'
>>> id(txt) => 183145248
>>> txt = txt.replace('l','_')
>>> txt => 'he__o'
>>> id(txt) => 141764608

Answer 3

Hey HonFu I meant how to remove a certain phrase from an inputted string.

Answer 4

Can you describe more clearly what exactly you want to do?

strcmp is a comparison function.

In Python you can compare strings with ==.

However, that's got nothing to do with subtraction, so please explain.

Answer 5

string.strip([chars]) is kind of similar. It removes whatever characters (or a string surrounded by ‘ ‘) you want from a string. If you don’t provide any characters, it removes any white space from either end of the original string.

Answer 6

basically strings are immutable. onces you created a string you can not changed it....
but by using replace method you can change some characters of it