On Wed, Oct 5, 2011 at 10:45 AM, Dave Angel <d...@davea.name> wrote:
> On 10/04/2011 10:22 PM, lina wrote:
>
>> On Wed, Oct 5, 2011 at 1:30 AM, Prasad,
>> Ramit<ramit.prasad@jpmorgan.**com<ramit.pra...@jpmorgan.com>
>> >wrote:
>>
>> But I still don't know how to get the
>>>> statistic result of each column,
>>>>
>>> Thanks.
>>> try:
>>> cols = len( text[0] ) # Find out how many columns there are (assuming
>>> each row has the same number of columns)
>>> except IndexError:
>>> raise # This will make sure you can see the error while developing;
>>>
>>> This part:
>>
>> It's showed up:
>>
>> except IndexError:
>>
> Best guess I can make is that the line "each row has..." needs a # in
> front of it. or maybe your code looks like the following, which has no try
> block at all.
>
> The except clause has to be the first line at the same indentation as the
> try line it's protecting.
>
>
> ^
>> SyntaxError: invalid syntax
>>
>> for fileName in os.listdir("."):
>> if os.path.isfile(fileName) and os.path.splitext(fileName)[1]=**
>> =".xpm":
>> filedata = open(fileName)
>> text=filedata.readlines()
>> cols = len(text[0])
>> except IndexError:
>> print ("Index Error.")
>> result=[]
>> for idx in xrange(cols):
>> results.append(0)
>> for line in text:
>> for col_idx, field in enumerate(line):
>> if token in field:
>> results[col_idx]+=1
>> for index in col_idx:
>> print results[index]
>>
>> it showed up:
>>
>> print results[]
>> ^
>> SyntaxError: invalid syntax
>>
>> Sorry, I am still lack deep understanding about something basic. Thanks
>> for
>> your patience.
>>
>>
>> Simplest answer here is you might have accidentally run this under Python
> 3.x. That would explain the syntax error on the print function. Pick a
> single version and stick to it. In fact, you might even put a version test
> at the beginning of the code to give an immediate error.
>
choose python3.
>
> But you do have many other problems with the code. One is that this no
> longer does anything useful with multiple tokens. (See my last email to see
> an approach that handles multiple tokens). Another is that you mix result
> and results. They're entirely distinct. So pick one spelling and stick to
> it.
This is a very good suggestions, I choose results.
> Another is that for the "for index" is indented wrong, and uses the wrong
> limit value. As it stands, it's trying to iterate over an integer. You
> probably want to replace the whole phrase with something like for item in
> results: print item
>
> This example illustrates one reason why it's a mistake to write all the
> code at top level. This code should probably be at least 4 functions, with
> each one handling one abstraction.
>
It's frustrating. Seriously. (I think I need to read some good (relevant)
codes first.
>
> Further, while you're developing, you should probably put the test data
> into a literal (probably a multiline literal using triplequotes), so you can
> experiment easily with changes to the data, and see how it results.
>
#!/bin/python
import os.path
tokens=['B','E']
for fileName in os.listdir("."):
if os.path.isfile(fileName) and os.path.splitext(fileName)[1]==".xpm":
filedata = open(fileName)
text=filedata.readlines()
results={}
numcolumns=len(text.strip())
for ch in tokens:
results[ch]=[0]*numcolumns
for line in text:
for col, ch in enumerate(line):
if ch in tokens:
results[ch][col]+=1
for item in results:
print item
$ python3 counter-vertically.py
File "counter-vertically.py", line 20
print item
^
SyntaxError: invalid syntax
>
> --
>
> DaveA
>
>
--
Best Regards,
lina
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
