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並前往https://stackoverflow.com/questions/74547926/python-valueerror-i-o-operation-on-closed-file-input-output-lab

io - Python: ValueError: I/O operation on closed file. Input ...

Files must keep open in the loop while reading. while number1 != "" and number2 != "": scalar_product += int(number1) * int(number2) number1 ...

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