Replace items in list, python

Question

I have a list of strings like this:

Item_has_was_updated_May_2010
Item_updated_Apr_2011
Item_got_updated_Sept_2011

I want to iterate through the list of string and update the last 2 parts of the string. The month and the year. The rest of the string I want to remain the same. The month and year will be taken from variables I have set earlier in my script, so let's call the month x and the year y.

My approach is to:

1. Iterate through the list of strings
2. Split each string by "_"
3. Replace the last 2 items
4. Join the items back together with the replaced items

The month and year will be taken from variables I have set earlier in my script, so let's call the month x and the year y.

If anyone can suggest a an approach, it is appreciated.

Answer 1

You can do it without regular expressions by using str.rsplit:

yourlist = [s.rsplit('_', 2)[0] + '_' + x + '_' + y for s in yourlist]

See it working online: ideone

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If you want to use formatting instead of string concatenation, try this:

yourlist = ['{}_{}_{}'.format(s.rsplit('_', 2)[0], x, y) for s in yourlist]

See it working online: ideone