> I'm going through an online tutorial for Jython (www.jython.org). I can't
> find a place to ask a question on that site so I thought I'd try here. I
> believe the code is supposed to traverse a directory, identifying file types.
> The script is failing with the following message:
>
> File "<string>", line None
> SyntaxError: Non-ASCII character in file
> 'H:\workspace\test\src\root\nested\example.py', but no encoding declared; see
> http://www.python.org/peps/pep-0263.html for details
Normally, this (obviously) means you have some non-ASCII characters (accented
characters would already do this) in your source code. Since this is just a
byte code at the lowest level, it needs to be decoded into something sensible,
which you specify using an encoding. Since Python refuses to guess which
encoding you want to use (the same character code could result in totally
different characters for different encodings), it's bailing out instead of
continuing (the exception being that by default, the Python interpreter assumes
your encoding is ASCII, and happily proceeds with that until it comes across a
character code outside the ASCII range).
In your code below, however, I don't see any non-ASCII characters. So my best
guess is that there is some invisible control-character outside the ASCII range
that's causing this error message.
This could happen because of a particular type of text-editor/IDE you're using.
The odd thing I find about the SyntaxError is actually that there is no line
number mentioned. In fact, 'File "<string>", line None' is a very weird
indication for telling where the error occurred. Might again be something to do
with your IDE.
I've tried your code by simply copy-pasting, and that works fine for me. So the
control-character didn't reach my mail program. In which case you could try to
copy-past the code from this reply into a new file and see if that's gotten rid
of the control-character (presuming that caused the problem).
Of course, if it's eg a known problem in Jython, I can't really tell you,
because I simply don't know Jython. But try clean code for a start.
HTH,
Evert
>
> Thank you,
> Shawn
>
>
import os, sys
from stat import *
def walktree(top, callback):
'''recursively descend the directory tree rooted at top,
calling the callback function for each regular file'''
for f in os.listdir(top):
pathname = os.path.join(top, f)
mode = os.stat(pathname)[ST_MODE]
if S_ISDIR(mode):
# It's a directory, recurse into it
walktree(pathname, callback)
elif S_ISREG(mode):
# It's a file, call the callback function
callback(pathname)
else:
# Unknown file type, print a message
print 'Skipping %s' % pathname
def visitfile(file):
print 'visiting', file
if __name__ == '__main__':
walktree(sys.argv[1], visitfile)
>
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