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_utils.py
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57 lines (42 loc) · 1.98 KB
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import os
import sys
import sys, traceback
# Avoid "LookupError: unknown encoding: ascii" when open() called in a destructor
outnull_file = open(os.devnull, "w")
errnull_file = open(os.devnull, "w")
class suppress_stdout_stderr(object):
# NOTE: these must be "saved" here to avoid exceptions when using
# this context manager inside of a __del__ method
sys = sys
os = os
def __init__(self, disable: bool = True):
self.disable = disable
# Oddly enough this works better than the contextlib version
def __enter__(self):
if self.disable:
return self
# Check if sys.stdout and sys.stderr have fileno method
if not hasattr(self.sys.stdout, 'fileno') or not hasattr(self.sys.stderr, 'fileno'):
return self # Return the instance without making changes
self.old_stdout_fileno_undup = self.sys.stdout.fileno()
self.old_stderr_fileno_undup = self.sys.stderr.fileno()
self.old_stdout_fileno = self.os.dup(self.old_stdout_fileno_undup)
self.old_stderr_fileno = self.os.dup(self.old_stderr_fileno_undup)
self.old_stdout = self.sys.stdout
self.old_stderr = self.sys.stderr
self.os.dup2(outnull_file.fileno(), self.old_stdout_fileno_undup)
self.os.dup2(errnull_file.fileno(), self.old_stderr_fileno_undup)
self.sys.stdout = outnull_file
self.sys.stderr = errnull_file
return self
def __exit__(self, *_):
if self.disable:
return
# Check if sys.stdout and sys.stderr have fileno method
if hasattr(self.sys.stdout, 'fileno') and hasattr(self.sys.stderr, 'fileno'):
self.sys.stdout = self.old_stdout
self.sys.stderr = self.old_stderr
self.os.dup2(self.old_stdout_fileno, self.old_stdout_fileno_undup)
self.os.dup2(self.old_stderr_fileno, self.old_stderr_fileno_undup)
self.os.close(self.old_stdout_fileno)
self.os.close(self.old_stderr_fileno)