My code outputs the correct answer when I call only the 2nd function. However, if I call the 1st function and then the 2nd, only the 1st function outputs what it's supposed to (the 2nd returns a blank line). Can anyone see any problem with the code and explain why calling the 2nd function after the first doesn't work?

Calling both

Outputs just the string from the first function and not the second:

print(createCodonString(myFile)) print(createReverseString(myFile)) gagacgtacttgttgttttaaataaacgaacaaattaaaatgtctgataatggaccccaa