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str.zfill(width)

#!/usr/bin/python3

str = "this is string example from tutorialpro....wow!!!"
print ("str.zfill : ",str.zfill(40))
print ("str.zfill : ",str.zfill(50))

str.zfill :  this is string example from tutorialpro....wow!!!
str.zfill :  000000this is string example from tutorialpro....wow!!!