[SOLVED] how can I combine a switch-case and regex in Python

how can I combine a switch-case and regex in Python

I want to process a string by matching it with a sequence of regular expression. As I'm trying to avoid nested if-then, I'm thinking of switch-case. How can I write the following structure in Python? Thank you

switch str:
   case match(regex1):
       # do something
   case match(regex2):
       # do sth else

I know Perl allows one to do that. Does Python?

Solution

You are looking for pyswitch (disclaimer: I am the author). With it, you can do the following, which is pretty close to the example you gave in your question:

from pyswitch import Switch

mySwitch = Switch()

@myswitch.caseRegEx(regex1)
def doSomething(matchObj, *args, **kwargs):
    # Do Something
    return 1

@myswitch.caseRegEx(regex2)
def doSomethingElse(matchObj, *args, **kwargs):
    # Do Something Else
    return 2

rval = myswitch(stringYouWantToSwitchOn)

There's a much more comprehensive example given at the URL I linked. pyswitch is not restricted to just switching on regular expressions. Internally, pyswitch uses a dispatch system similar to the examples others have given above. I just got tired of having to re-write the same code framework over and over every time I needed that kind of dispatch system, so I wrote pyswitch.