问题
I'm running ./sample.py --url http://blah.com without error, though if I run ./sample.py --url http://blah.com | wc -l or similar I receive an error:
UnicodeEncodeError: 'ascii' codec can't encode character u'\u200f' in position 0: ordinal not in range(128)
How do I make a python script compatible with my terminal commands? I keep seeing reference to sys.stdin.isatty though its use case appears to be opposite.
回答1:
When Python detects that it is printing to a terminal, sys.stdout.encoding is set to the encoding of the terminal. When you print a unicode, the unicode is encoded to a str using the sys.stdout.encoding.
When Python does not detect that it is printing to a terminal, sys.stdout.encoding is set to None. When you print a unicode, the ascii codec is used (at least in Python2). This will result in a UnicodeError if the unicode contains code points outside of 0-127.
One way to fix this is to explicitly encode your unicode before printing. That perhaps is the proper way, but it can be laborious if you have a lot of print statements scattered around.
Another way to fix this is to set the PYTHONIOENCODING environment variable to an appropriate encoding. For example,
PYTHONIOENCODING=utf-8
Then this encoding will be used instead of ascii when printing output to a file.
See the PrintFails wiki page for more information.
回答2:
Try:
(./sample.py --url http://blah.com) | wc -l
This spawns a subshell to run your python script then pipes the output from stdout to wc
来源：https://stackoverflow.com/questions/13481582/pipe-output-of-python-script