Percent sign at the end of the output of python script [closed]

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Why is a percent sign at the end of the output of the python script?

$ echo "TEST TEST" | trim
TESTTEST%

#!/usr/bin/env python
import sys

if __name__ == "__main__":
    for line in sys.stdin:
        sys.stdout.write(''.join(line.split()))

回答1:

The % you see there might actually be your shell prompt, and not part of your program output. You're not writing a new line after your output, so the shell prompt appears at the very end of the output of the last command.

Possible solutions:

1. Use print instead of sys.stdout.write
2. Append a newline to the end of the output with + "\n"
3. Add a print() to the end of your program

来源：https://stackoverflow.com/questions/36270945/percent-sign-at-the-end-of-the-output-of-python-script