[python] stdoutをStringIOで置き換える

dummy_stdout.py

# -*- coding: utf-8 -*-

import sys
from io import StringIO
from contextlib import contextmanager

@contextmanager
def dummy_stdout():
    sout = sys.stdout
    sys.stdout = StringIO()
    try:
        yield sys.stdout
    finally:
        sys.stdout = sout

with dummy_stdout():
    print("ABC")
    output = sys.stdout.getvalue()

print(f"output={output!r}")