basic python questions

[tom]

nateastle at gmail.com wrote:
> I have taken the coments and think I have implemented most. My only
> question is how to use the enumerator. Here is what I did, I have tried
> a couple of things but was unable to figure out how to get the line
> number.
>
>   
Try this in the interpreter,

l = [5,4,3,2,1]
for count, i in enumerate(l):
    print count, i


> def Xref(filename):
>     try:
>         fp = open(filename, "r")
>     except:
>         raise "Couldn't read input file \"%s\"" % filename
>     dict = {}
>     line_num=0
>     for words in iter(fp.readline,""):
>         words = set(words.split())
>         line_num = line_num+1
>         for word in words:
>             word = word.strip(".,!?:;")
>             if not dict.has_key(word):
>                 dict[word] = []
>             dict[word].append(line_num)
>     fp.close()
>     keys = sorted(dict);
>     for key in keys:
>         print key," : ", dict[key]
>     return dict
>
> Marc 'BlackJack' Rintsch wrote:
>   
>> In <1163829271.660193.70450 at j44g2000cwa.googlegroups.com>,
>> nateastle at gmail.com wrote:
>>
>>     
>>> def Xref(filename):
>>>     try:
>>>         fp = open(filename, "r")
>>>         lines = fp.readlines()
>>>         fp.close()
>>>     except:
>>>         raise "Couldn't read input file \"%s\"" % filename
>>>     dict = {}
>>>     for line_num in xrange(len(lines)):
>>>       
>> Instead of reading the file completely into a list you can iterate over
>> the (open) file object and the `enumerate()` function can be used to get
>> an index number for each line.
>>
>>     
>>>         if lines[line_num] == "":  continue
>>>       
>> Take a look at the lines you've read and you'll see why the ``continue``
>> is never executed.
>>
>>     
>>>         words = lines[line_num].split()
>>>         for word in words:
>>>             if not dict.has_key(word):
>>>                 dict[word] = []
>>>             if line_num+1 not in dict[word]:
>>>                 dict[word].append(line_num+1)
>>>       
>> Instead of dealing with words that appear more than once in a line you may
>> use a `set()` to remove duplicates before entering the loop.
>>
>> Ciao,
>> 	Marc 'BlackJack' Rintsch
>>     
>
>