write a file after create some random strings [duplicate]

Question

import random
class simulate_DNA:
    def create_DNA(length):
        sequence = ""
        for i in range(length):
            sequence = sequence + random.choice("ATGC")
        return print(sequence)
def main():
    length = 10
    output_file = input("Enter output file path and name: ")
    output_file = open(output_file, "w")
    for i in range(10):
        # simulate_DNA.create_DNA(length)
        output_file.write(simulate_DNA.create_DNA(length))
        output_file.readline()
    output_file.close()
if __name__ == '__main__':
    main()

I got this error after running the code above: TypeError: write() argument must be str, not None Would anyone please tell me how to fix this error? Thank you so much!

Answer 1

The print function returns None, and you're trying to return the result of the print function => So it's None

Replace this: return print(sequence) By: return sequence