python - Algorithm to reduce a software version? -


i've been struggling problem in last few hours , couldn't figure out solution myself. problem simple:

in: 'subtract('1.1.5', 4)' out: '1.1.1'  in: 'subtract('1.1.5', 6)' out: '1.0.9'  in: 'subtract('1.0.0', 1)' out: '0.9.9'  in: 'subtract('1.14.5', 8)' out: '1.13.7'  in: 'subtract('1.10.10', 20)' out: '1.9.0'

i've come couple of complex algorithms complex seems simple solve, ideas?

this i've tried far (not working cases):

def subtract(version, sub):   arrv = version.split('.')   index = len(arrv) - 1   sub = -abs(sub)    while(sub < 0 , index >= 0):      vlen = len(arrv[index])     m = 10 ** (vlen - 1)     = int(arrv[index])      if (i + sub < 0):       arrv[index] = str(m - (abs(sub) % m))       sub = int(sub / m)     else:       arrv[index] = str(i + sub)       sub = 0      index -= 1     print(arrv)   return '.'.join(arrv)    print(subtract('1.10.10', 5) == '1.10.5') print(subtract('1.10.10', 12) == '1.9.8') print(subtract('1.10.10', 10) == '1.10.0') print(subtract('1.10.10', 1010) == '1.0.0')


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