In Python source code file docstrings, replace dashes- by equals= using sed

replace_sourcecode_dashes.py

"""In Python source code file docstrings, replace dashes- by equals= using sed"""
import subprocess
import os

def sed_replace_patterns(wdir,maxdash=20,mindash=2):

    for n in xrange(maxdash,mindash+1,-1):
        pstr = '-'*n # pattern
        sstr = '='*n # substitute

        sedstr = 's/{}/{}/g'.format(pstr,sstr)

        sedcmd = ['sed','-i',sedstr,wdir+'/*.py']
        print 'executing '+' '.join(sedcmd)

        subprocess.check_call(sedcmd)



if __name__ == "__main__":

    wdir = '.'

    os.chdir(wdir)
    
    print os.getcwd()

    sed_replace_patterns(wdir)