pymel has a package to convert from Mel to Pyhon, it works for commands and 
all its flags, and even has a method to convert complete Mel files.
So on your example:
import pymel.tools.mel2py as mel2py
print mel2py.mel2pyStr('dgdirty -a;')
#result: dgdirty(a=1)

the only thing that you need to add the cmds import and the namespace to 
the command (i.e. from maya import cmds and "cmds." at the beginning)
here you can find more info
https://help.autodesk.com/cloudhelp/2016/ENU/Maya-Tech-Docs/PyMel/generated/pymel.tools.mel2py.html#mel-to-python-translator


El miércoles, 9 de mayo de 2018, 19:57:50 (UTC+2), Ravi escribió:
>
> anyone help me this small mel script to python please 
>
>
> dgdirty -a
>

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