[Tutor] renaming files within a directory

[davidwilson at Safe-mail.net]

Here is what I have so far:

import os
import csv

countries = {}
reader = csv.reader(open("countries.csv"))
for row in reader:
    code, name = row
    countries[name] = code

files = set([file for file in os.listdir(os.getcwd()) if file.endswith('svg')])
print len(files)

for file in files:
    file = file.strip('.svg')
    print file
#    if countries.has_key(file):
#	print file

When I run this I get:

Flag_of_Uganda
Flag_of_the_United_State
Flag_of_Abkhazia
Flag_of_Montenegro
Flag_of_Qatar
Flag_of_Gabon
Flag_of_Uzbekistan
Flag_of_Kiribati
Flag_of_Armenia
Flag_of_Panama
Flag_of_Monaco
Flag_of_Australia
Flag_of_Liechtenstein
Flag_of_Tunisia
Flag_of_Georgia
Flag_of_Palau
Flag_of_the_Central_African_Republic
...

The problem is that for example the file Flag_of_the_United_States.svg when I use the strip('.svg') it is returned as Flag_of_the_United_State

Also, How do I remove 'Flag_of', 'Flag_of_the_' 

I guess after this I can compare the value with the key and map the tld?

Or is it better to use regex and then search from the list of countries? But how???

-------- Original Message --------
From: Tim Golden <mail at timgolden.me.uk>
Apparently from: tutor-bounces+davidwilson=safe-mail.net at python.org
To: 
Cc: tutor at python.org
Subject: Re: [Tutor] renaming files within a directory
Date: Sun, 26 Jul 2009 20:41:10 +0100

> davidwilson at Safe-mail.net wrote:
> > OK I am lost ;(
> > 
> > I changed the code to:
> > 
> >>>> reader = csv.reader(open("countries.csv"),  delimiter=";")
> >>>> for row in reader:
> > ...     print row 
> > ... 
> > ['bi', 'Burundi']
> > ['km', 'Comoros']
> > ['dj', 'Djibouti']
> > ['er', 'Eritrea']
> > 
> > ...
> > 
> > Now each row is a list with two items each.
> > 
> > But when I do this:
> > 
> >>>> dic = []
> >>>> for row in reader:
> > ...         newdic.append({row[0]: row[1]})
> > ... 
> >>>> dic
> > []
> > 
> > I get an empty dictionary
> 
> Well, you actually get an empty list :)
> To instantiate an empty dictionary, you use curly brackets:
> 
> d = {}
> 
> To add something to a dictionary, you use:
> 
> d[<key>] = <value>
> 
> Try something like this:
> 
> <code - untested>
> import csv
> 
> reader = csv.reader(open("countries.csv"),  delimiter=";")
> countries = {} # note the curly brackets
> for row in reader:
>    code, name = row # handy Python tuple unpacking
>    countries[name] = code
> 
> </code>
> 
> 
> Once you're used to the idea, you can get reasonably slick
> with dictionary initialisers and generator expressions:
> 
> import csv
> 
> reader = csv.reader(open("countries.csv"),  delimiter=";")
> countries = dict ((row[1], row[0]) for row in reader)
> 
> And once you're really confident (and if you're a
> fan of one-liners) you can get away with this:
> 
> import csv
> countries = dict (
>    (name, code) for \
>      (code, name) in \
>      csv.reader (open ("countries.csv"), delimiter=";")
> )
> 
> 
> BTW, I tend to open csv files with "rb" as it seems to
> avoid line-ending issues with the csv module. YMMV.
> 
> TJG
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