基于@Yinon
Ehrlich的答案。此变体尝试避免泄漏文件描述符：
import osimport sysfrom contextlib import contextmanager@contextmanagerdef stdout_redirected(to=os.devnull): ''' import os with stdout_redirected(to=filename): print("from Python") os.system("echo non-Python applications are also supported") ''' fd = sys.stdout.fileno() ##### assert that Python and C stdio write using the same file descriptor ####assert libc.fileno(ctypes.c_void_p.in_dll(libc, "stdout")) == fd == 1 def _redirect_stdout(to): sys.stdout.close() # + implicit flush() os.dup2(to.fileno(), fd) # fd writes to 'to' file sys.stdout = os.fdopen(fd, 'w') # Python writes to fd with os.fdopen(os.dup(fd), 'w') as old_stdout: with open(to, 'w') as file: _redirect_stdout(to=file) try: yield # allow pre to be run with the redirected stdout finally: _redirect_stdout(to=old_stdout) # restore stdout.# buffering and flags such as# CLOEXEC may be different
