DNA python old | Python Fiddle

import re

def subStrings(s, z):
    length = len(s)
    for size in range (length, 0, -1):
        startIdx = 0
        endIdx = startIdx + size
    
    while (endIdx <= length):
        if (len(s[startIdx:endIdx]) > 1) and re.search(s[startIdx:endIdx], z):
            com = (s[startIdx:endIdx]) + "\n"
            lengthCom = len(s[startIdx:endIdx])
        for size in range (lengthCom, 0, -1):
          startIdx = startIdx + 1
          endIdx = startIdx + size

while (endIdx <= length):
            if lengthCom == len(s[startIdx:endIdx]) and re.search(s[startIdx:endIdx], z):
              com = com + '{:^20}'.format(s[startIdx:endIdx]) + "\n"
              startIdx = startIdx + 1
              endIdx = startIdx + size
              return com
            startIdx = startIdx + 1
            endIdx = startIdx + size
            return 'No Common Sequence Found'

def main():
    inFile = open ("testCases2.txt", "r") 
    x =  int(inFile.readline())
    for n in range(1, 2 * x + 1):
        globals()['dna' + str(n)] = inFile.readline()
    inFile.close()
    for n in range(1, 2 * x + 1):
            eval('dna' + str(n)).upper()

print("Longest Common Sequences")
    print()
    for i in range(1, x + 1):
                print('Pair ' + str(i) + ": " + subStrings(eval('dna' + str(2 * i)), eval('dna' + str(2 * i - 1))))
main()

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