Python – reset stdout to normal, after previously redirecting it to a file
Question:
At the beginning of my python program I have the following line:
sys.stdout = open('stdout_file', 'w')
Halfway through my program I would like to set stdout back to the normal stdout. How do I do this?
Answers:
The original stdout can be accessed as sys.__stdout__. This is documented.
The same holds for stderr, of course. At the end, these lines are needed to get the original streams.
sys.stdout = sys.__stdout__
sys.stderr = sys.__stderr__
Another common practice is to store the default stdout and / or stdin and then return them once you are finished with sending your output / input to custom streams.
For instance:
orig_stdout = sys.stdout
sys.stdout = open('stdout_file', 'w')
sys.stdout = orig_stdout
open file and exchange sys variable with file variable
f = open("sample.txt", "w")
sys.stdout, f = f, sys.stdout
print("sample", flush=True)
and take it back
f, sys.stdout = sys.stdout, f
print("sample")
At the beginning of my python program I have the following line:
sys.stdout = open('stdout_file', 'w')
Halfway through my program I would like to set stdout back to the normal stdout. How do I do this?
The original stdout can be accessed as sys.__stdout__. This is documented.
The same holds for stderr, of course. At the end, these lines are needed to get the original streams.
sys.stdout = sys.__stdout__
sys.stderr = sys.__stderr__
Another common practice is to store the default stdout and / or stdin and then return them once you are finished with sending your output / input to custom streams.
For instance:
orig_stdout = sys.stdout
sys.stdout = open('stdout_file', 'w')
sys.stdout = orig_stdout
open file and exchange sys variable with file variable
f = open("sample.txt", "w")
sys.stdout, f = f, sys.stdout
print("sample", flush=True)
and take it back
f, sys.stdout = sys.stdout, f
print("sample")