How to remove a substring that starts and ends with certain characters in Python

Question

I have a string like this

foldername/pic.jpg

How can I remove this part /pic so the new string will become foldername.jpg?

EDIT: I want to replace any string that starts with / and end with . with a dot (.) so the new file name only contains the foldername.jpg

Just to be clear, do you want to remove the part starts with slash until a dot or is it always /pic? — Lafexlos
– Lafexlos, Commented Jun 15, 2017 at 5:06

kuro · Accepted Answer · 2017-06-15 05:16:03Z

2

You can use re module. Try -

import re
a = 'foldername/pic.jpg'
out = re.sub(r'/.*\.', r'.', a)
print(out)

edited Jun 15, 2017 at 5:16

answered Jun 15, 2017 at 5:12

kuro

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Ofer Sadan · Accepted Answer · 2017-06-15 05:12:26Z

1

if that is all you have, you can do it like this:

name = 'foldername/pic.jpg'
root = name.split('/')[0]
ext = name.split('.')[1]
name = root + ext

but if you are splitting file-paths, you will be better off with os.path commands, for example:

import os
name = 'foldername/pic.jpg'
root = os.path.dirname(name)
_, ext = os.path.splitext(name)
name = root + '.' + ext

both cases return a string foldername.jpg in these cases, but the os.path commands are more flexible

edited Jun 15, 2017 at 5:12

answered Jun 15, 2017 at 5:08

Ofer Sadan

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Comments

clocker · Accepted Answer · 2017-06-15 05:14:10Z

1

For a more generic solution, try regular expressions. In your specific example, I will make the assumption you want to remove a substring that starts with '/', and ends with 'c' (ie, /pic).

In [394]: import re
In [395]: re.sub(r'(.+)\/\w+c(.+)', r'\1\2', 'foldername/pic.jpg')
Out[395]: 'foldername.jpg'

Just note that the second argument needs the raw string encapsulator r' ', if you want to interpolate variables, else the \1 or \2 have no effect.

answered Jun 15, 2017 at 5:14

clocker

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