Python Brute Force Solution to Euler Project Problem 60

My cumbersome solution to https://projecteuler.net/problem=60 but I'll take it. I cheated by setting the loop limits to 10000.

---

import math

from math import sqrt

def isPrime(n):

 prime_flag = 0

 if(n > 1):

  for i in range(2, int(sqrt(n)) + 1):

   if (n % i == 0):

    prime_flag = 1

    break

  if (prime_flag == 0):

   return True

  else:

   return False

 else:

  return False

# main sequence

concatprime = False

start = 2

for a in range(start, 10000):

 if isPrime(a) and concatprime == False:

  for b in range(a+1, 10000):

   if isPrime(b):

    ab = str(a)+str(b)

    ba = str(b)+str(a)

    if isPrime(int(ab)) and isPrime(int(ba)):

     #print(str(a)+","+str(b))

     for c in range(b+1, 10000):

      if isPrime(c):

       ac = str(a)+str(c)

       ca = str(c)+str(a)

       bc = str(b)+str(c)

       cb = str(c)+str(b)

       if isPrime(int(ac)) and isPrime(int(ca)) and isPrime(int(bc)) and isPrime(int(cb)):

        #print(str(a)+","+str(b)+","+str(c))

        for d in range(c+1, 10000):

         if isPrime(d):

          da = str(d)+str(a)

          ad = str(a)+str(d)

          db = str(d)+str(b)

          bd = str(b)+str(d)

          dc = str(d)+str(c)

          cd = str(c)+str(d)

          if isPrime(int(da)) and isPrime(int(ad)) and isPrime(int(db)) and isPrime(int(bd)) and isPrime(int(dc)) and isPrime(int(cd)):

           #print(str(a)+","+str(b)+","+str(c)+","+str(d))

           for e in range(d+1, 10000):

            if isPrime(e):

             ea = str(e)+str(a)

             ae = str(a)+str(e)

             eb = str(e)+str(b)

             be = str(b)+str(e)

             ec = str(e)+str(c)

             ce = str(c)+str(e)

             ed = str(e)+str(d)

             de = str(d)+str(e)

             if isPrime(int(ea)) and isPrime(int(ae)) and isPrime(int(eb)) and isPrime(int(be)) and isPrime(int(ec)) and isPrime(int(ce)) and isPrime(int(ed)) and isPrime(int(de)):

              print(str(a)+","+str(b)+","+str(c)+","+str(d)+","+str(e))

              print(a+b+c+d+e)

              concatprime = True

              #start = 10000

              break