[email protected] 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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