python - Recursive code returns None -


i not understand, why code

def isin(char, astr):      ms = len(astr)/2     if astr[ms] == char:         print 'i here now'         return true     elif char>astr[ms] , not ms == len(astr)-1:         astr = astr[ms+1:]     elif char <astr[ms] , not ms == 0:         astr = astr[0:ms]     else:         return false     isin(char, astr)  print isin('a', 'ab')

does keep on returning none. prints 'i here now', not return true, next line says. why?

you want return on last line:

return isin(char, astr)

without it, function returns none when terminates without seeing return.


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