I have the following code in python:
import os class suppress_stdout_stderr(object): ''' A context manager for doing a "deep suppression" of stdout and stderr in Python, i.e. will suppress all print, even if the print originates in a compiled C/Fortran sub-function. This will not suppress raised exceptions, since exceptions are printed to stderr just before a script exits, and after the context manager has exited (at least, I think that is why it lets exceptions through). ''' def __init__(self): # Open a pair of null files self.null_fds = [os.open(os.devnull,os.O_RDWR) for x in range(2)] # Save the actual stdout (1) and stderr (2) file descriptors. self.save_fds = (os.dup(1), os.dup(2)) def __enter__(self): # Assign the null pointers to stdout and stderr. os.dup2(self.null_fds[0],1) os.dup2(self.null_fds[1],2) def __exit__(self, *_): # Re-assign the real stdout/stderr back to (1) and (2) os.dup2(self.save_fds[0],1) os.dup2(self.save_fds[1],2) # Close the null files os.close(self.null_fds[0]) os.close(self.null_fds[1]) for i in range(10**6): with suppress_stdout_stderr(): print 'plop' if i % 50 == 0: print i it fails at 5100 on OSX with OSError: [Errno 24] Too many open files. I'm wondering why and if there is a solution to close the file descriptor. I'm looking for a solution for a context manager which closes stdout and stderr.
f = open(...); f.close().