[Tutor] a quick Q: how to use for loop to read a series of files with .doc end

[lina]

On Fri, Oct 7, 2011 at 9:50 AM, Steven D'Aprano <steve at pearwood.info> wrote:

> lina wrote:
>
>  May I ask a further question:
>>
>>  a
>>>>>
>>>> {'B': [4, 5, 6], 'E': {1, 2, 3}}
>>
>
> Why is a['B'] a list and a['E'] a set?
>
>
>
>
>  How can I get the value of
>> set(a['E'])+set(a['B'])
>>
>> I mean, get a new dict 'B+E':[5,7,9]
>>
>
>
> You are confusing different things into one question, as if I had asked:
>
> "How do I make a hard boiled egg? I mean, get a potato salad."
>
> You must ask a clear question to get a clear answer.
>
>
>
> To answer your first question, what do you mean by adding two sets? I can
> take the *union* of two sets (anything in either one OR the other):
>
> >>> a['E'] | set(a['B'])  # one is already a set, no need to convert
> {1, 2, 3, 4, 5, 6}
>
>
> or I can take the *intersection* of the two sets (anything in both one AND
> the other):
>
> >>> a['E'] & set(a['B'])
> set()
>
> There are no items in common between the two, so nothing in the
> intersection.
>
>
> To get the result you are asking for:
>
> [5, 7, 9]
>
> makes no sense. How do you expect to get a *list* by combining two *sets*?
> They are different things. Lists have order, sets do not:
>
> >>> [1, 2, 3] == [3, 2, 1]
> False
> >>> {1, 2, 3} == {3, 2, 1}
> True
>
>
> A list is a sequence of values in order, a set is like a jumble of values
> tossed in a bag.
>
> My *guess* is that you don't care about sets at all, you want two lists:
>

Thanks, I did not realize the great differences between the list and sets. I
was not so sensitive about the concepts before.

>
>
> [1, 2, 3]
> [4, 5, 6]
>
>
> and you want to add them item by item to get another list:
>
> [5, 7, 9]
>
>
> Have I guessed correctly?
>
>
> If so, here's the hard way to do it:
>
>
> first_list = [1, 2, 3]
> second_list = [4, 5, 6]
> result = []
> for i in range(3):
>    a = first_list[i]
>    b = second_list[i]
>    result.append(a + b)
>
> print(result)
>
>
> Walking along two lists in lock-step like that is so common that Python has
> a dedicated function specially for it: zip.
>
> result = []
> for a,b in zip(first_list, second_list):
>    result.append(a+b)
>
>
> which can be simplified further to a list comprehension:
>
> result = [a+b for a,b in zip(first_list, second_list)]
>
>
Thanks, just why the output it's something double, more than I want.

#!/bin/python3

import os.path

TOKENS="BE"
LINESTOSKIP=0
INFILEEXT=".xpm"
OUTFILEEXT=".txt"

def dofiles(topdirectory):
    for filename in os.listdir(topdirectory):
        processfile(filename)

def processfile(infilename):
    results={}
    base, ext =os.path.splitext(infilename)
    if ext == INFILEEXT:
        text = fetchonefiledata(infilename)
        numcolumns=len(text[0])
        for ch in TOKENS:
            results[ch] = [0]*numcolumns
        for line in text:
            line = line.strip()
        for col, ch in enumerate(line):
            if ch in TOKENS:
                results[ch][col]+=1
        for k,v in results.items():
            print(results)
            summary=[]
            for a,b in zip(results['E'],results['B']):
                summary.append(a+b)
        writeonefiledata(base+OUTFILEEXT,summary)

def fetchonefiledata(inname):
    infile = open(inname)
    text = infile.readlines()
    return text[LINESTOSKIP:]

def writeonefiledata(outname,summary):
    outfile = open(outname,"w")
    for elem in summary:
        outfile.write(str(summary))


if __name__=="__main__":
    dofiles(".")


 $ python3 counter-vertically-v2.py
{'B': [0, 0, 0, 0, 0, 0], 'E': [1, 0, 1, 0, 1, 0]}
{'B': [0, 0, 0, 0, 0, 0], 'E': [1, 0, 1, 0, 1, 0]}

$ more try.txt
[1, 0, 1, 0, 1, 0][1, 0, 1, 0, 1, 0][1, 0, 1, 0, 1, 0][1, 0, 1, 0, 1, 0][1,
0, 1
, 0, 1, 0][1, 0, 1, 0, 1, 0]

$ more try.xpm
aaEbb
aEEbb
EaEbb
EaEbE

Thanks,

>
>
> --
> Steven
>
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-- 
Best Regards,

lina
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