从文本文件web2py读取 [英] Reading from a text file web2py

问题描述

我在使用web2py时遇到问题.我在modules文件夹中有一个名为defVals.txt的文本文件.我尝试使用open("defVals.txt")(在与defVals.txt相同的控制器中的模块中)从中读取内容，但出现错误:

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'

我做错了什么?我应该在哪里放置defVals.txt

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

我正在使用Ubuntu 12.10

I'm using Ubuntu 12.10

谢谢

乔丹

更新:

这是defaultValParser.py的源代码:

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))

如果我从终端导入并调用它(如果我注释掉了胶子导入)，它可以很好地工作，但是如果我从web2py控制器中调用它，它将完全失败:

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'

推荐答案

使用基于模块__file__路径的绝对路径:

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__是当前模块的文件名，使用其中的.dirname()为您提供模块所在的目录.我使用.abspath()来确保您始终具有模块文件的绝对路径，避开可能会碰到的边缘情况.

__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是模块中的全局变量.

moduledir is a global in your module.

这篇关于从文本文件web2py读取的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！