Trouble tying everything together with main function using python -


i new programing , having trouble getting main function work. print statement gives me error:

candidate not defined

but shouldn't findbestcandidate function provide it? doing wrong?? me in right direction awesome!

def filetolist(filename):     import os.path     if os.path.isfile(filename) == true:         file = open(filename, "r")         strings = file.read().splitlines()         file.close()         return strings     if os.path.isfile(filename) == false:         return []  def returnfirststring(strings):     string = ''     if len(strings) != 0:         string = string + strings[0]     return string  def strandsarenotempty(strand1,strand2):     if len(strand1) != 0 , len(strand2) != 0:         return true     return false  def strandsareequallengths(strand1,strand2):     if len(strand1) == len(strand2):         return true     return false  def findlargestoverlap(target,candidate):     if len(target) != len(candidate):         return -1     if len(target) == 0 or len(candidate) == 0:         return -1     c = ''     ol = 0     char in candidate:         c += char         if target[(len(target)-len(c)):] == c:             ol = len(c)     return ol  def findbestcandidate(target,candidates):     overlap = 0     candidate = ''     can in candidates:         ol = findlargestoverlap(target, can)         if ol > overlap:             overlap = ol             candidate = can     return (candidate, overlap)  def jointwostrands(target,candidate,overlap):     return target+candidate[overlap:]  def main():     target = input('enter target strand filename:')     candidates = input('enter candidate strands filename:')     filetolist(target)     filetolist(candidates)     findbestcandidate(target,candidates)     print(jointwostrands(target,candidate,overlap))  if __name__ == '__main__':      main()

for findbestcandidate function, should call this, proceed on same fashion other function calls, i.e. storing result in variables in main

def main():     ...     candidate, overlap = findbestcandidate(target,candidates)     ...

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