Question

Write a function which receives a list and returns a number. In the list, all numbers have been repeated twice except one number that is repeated once. The function should return the number that is repeated once and return it.write a python program for this question. use main function.

Answer 1

CODE:

def returnDuplicateOnce(numbers:list):
#traversing the list
for i in numbers:
#if the current number in the list is repeated once or appears only twice in
#the list, then that number is returned
if(numbers.count(i) == 2):
return i
return None
  
def main():
#list of numbers
numbers = [1,1,1,24,24,6,3,6,3,6,3]
#calling the function
print('Numbers in the list repeated once:',returnDuplicateOnce(numbers))
#calling the main function
if __name__ == '__main__':
main()

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CODE IMAGES AND OUTPUT:

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