Python-list Digest, Vol 70, Issue 282

[Ryniek90]

>
>> When i use this class in Python IDLE, i've got this error: "
>>     
> ...
>   
>> Traceback (most recent call last):
>>   File "<pyshell#60>", line 1, in <module>
>>     mod.print_module('socket')
>>   File "<pyshell#57>", line 48, in print_module
>>     module_open = open(self._this_module, 'rb')
>> IOError: [Errno 2] No such file or directory: ''
>>  >>>
>> "
>>
>> As You can see, i can't assign the new value "os.path.join(root, f)" to
>> the 'self._this_module variable'.
>>     
>
> In the __init__ method, you successfully set the `_this_module` attribute:
>
>         self._this_module = ''
>
> That works, so it proves that you *can* set a private attribute.
>
> Later on, you call the `_SetVar` method, which does this:
>
>     def _SetVar(self, attr, val):
>         self.attr = val   
>
> In English, this method does this:
>
> (1) Take two arguments, and store them in variables called "attr" and 
> "val".
>
> (2) Assign the value stored in "val" to an attribute named exactly "attr".
>
> What you actually want is:
>
> (1) Take two arguments, and store them in variables called "attr" and 
> "val".
>
> (2) Assign the value stored in "val" to an attribute with the name stored 
> in the variable "attr".
>
> Can you see the difference?
>
> What you actually want is:
>
>     def _SetVar(self, attr, val):
>         setattr(self, attr, val)
>
>
> Your code is terribly complicated. This will probably do what you want. 
> (Warning -- I haven't tested it, so there may be a few errors.)
>
>
> class ModPrint(object):
>     u"""
>     This will be the doc.
>     """
>     def __init__(self, default_search_path=''):
>         self.default_search_path = ''
>
>    def find_module(self, modulename, search_path=''):
>        if search_path == '':
>            # Try the default search path instead.
>            search_path = self.default_search_path
>         if search_path == '':  # still blank.
>             # Try the Python search path instead.
>            search_path = sys.exec_prefix
>         for root, dirs, files in os.walk(search_path):
>             for f in files:
>                 if f == "%s.py" % modulename:
>                     return os.path.join(root, f)
>
>     def get_module_text(self, modulename, search_path=''):
>         filename = self.find_module(modulename, search_path)
>         module_open = open(filename, 'rb')
>         module_text = module_open.read()
>         module_open.close()
>         return module_text
>
>
> I changed the name of print_module_text because it doesn't actually print 
> anything.
>   

Thanks for ready class - it works great, but that code:
"

What you actually want is:

    def _SetVar(self, attr, val):
        setattr(self, attr, val)


"
Didn't worked, so i wil reuse your class, and modify it later. Now i see 
that working on private objects complex.