Reading from a text file web2py

问题

I'm having an issue with web2py. I have a text file called defVals.txt that's in the modules folder. I try to read from it, using open("defVals.txt") (in a Module in the same director as defVals.txt), but I get the error:

Traceback (most recent call last):
 File "/home/jordan/web2py/gluon/restricted.py", line 212, in restricted
   exec ccode in environment
File "/home/jordan/web2py/applications/randommotif/controllers/default.py", line 67,     in <module>
 File "/home/jordan/web2py/gluon/globals.py", line 188, in <lambda>
self._caller = lambda f: f()
File "/home/jordan/web2py/applications/randommotif/controllers/default.py", line 13, in index
  defaultData = parse('defVals.txt')
File "applications/randommotif/modules/defaultValParser.py", line 6, in parse
 lines = open(fileName)
IOError: [Errno 2] No such file or directory: 'defVals.txt'

What am I doing wrong? Where should I place defVals.txt

I'm using Ubuntu 12.10

Thanks,

Jordan

Update:

This is the source code to defaultValParser.py:

import itertools
import string
import os
from gluon import *
from gluon.custom_import import track_changes; track_changes(True)

#this returns a dictionary with the variables in it.
def parse(fileName):
    moduleDir = os.path.dirname(os.path.abspath('defaultValParser.py'))
    filePath = os.path.join(moduleDir, fileName)
    lines = open(filePath, 'r')
    #remove lines that are comments. Be sure to remove whitespace in the beginning and end of line
    real = filter(lambda x: (x.strip())[0:2] != '//', lines)
    parts = (''.join(list(itertools.chain(*real)))).split("<>")
    names = map(lambda x: (x.split('=')[0]).strip(), parts)
    values = map(lambda x: eval(x.split('=')[1]), parts)
    return dict(zip(names, values))

It works fine if I import it and call it from a terminal (provided I comment out the gluon imports), but if I call it from a web2py controller, it fails completely:

Traceback (most recent call last):
  File "/home/jordan/web2py/gluon/restricted.py", line 212, in restricted
   exec ccode in environment
  File "/home/jordan/web2py/applications/randommotif/controllers/default.py", line 71, in <module>
  File "/home/jordan/web2py/gluon/globals.py", line 188, in <lambda>
  self._caller = lambda f: f()
  File "/home/jordan/web2py/applications/randommotif/controllers/default.py", line 17, in index
  defaultData = parse('defVals.txt')
  File "applications/randommotif/modules/defaultValParser.py", line 6, in parse
 IOError: [Errno 2] No such file or directory: 'defVals.txt'

回答1:

Use an absolute path based on the __file__ path of the module:

moduledir = os.path.dirname(os.path.abspath('__file__'))

# ..
defaultData = parse(os.path.join(moduledir, 'defVals.txt'))

__file__ is the filename of the current module, using the .dirname() of that gives you the directory the module is in. I used .abspath() to make sure you have an absolute path for your module file at all times, heading off some edgecases you could hit otherwise.

moduledir is a global in your module.

来源：https://stackoverflow.com/questions/14015128/reading-from-a-text-file-web2py

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