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Converting Between Different Naming Convetions

09.18.2005
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        From Sami Hangaslammi's <a href=http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66009>recipe</a>.
import re

def cw2us(x): # capwords to underscore notation
    return re.sub(r'(?<=[a-z])[A-Z]|(?<!^)[A-Z](?=[a-z])', r"_\g<0>", x).lower()

def mc2us(x): # mixed case to underscore notation
    return cw2us(x)

def us2mc(x): # underscore to mixed case notation
    return re.sub(r'_([a-z])', lambda m: (m.group(1).upper()), x)

def us2cw(x): # underscore to capwords notation
    s = us2mc(x)
    return s[0].upper()+s[1:]
Result
>>> cw2us("PrintHTML")
'print_html'
>>> cw2us("IOError")
'io_error'
>>> cw2us("SetXYPosition")
'set_xy_position'
>>> cw2us("GetX")
'get_x'