Question

how to find key of a value in a dictionary

Answer 1

excuse me, but why would you need that?.. the idea of dicts is using the keys as indexes to get values not the other way around..

Answer 2

okk

basically i want input from user and check it agaist my dictionary values and return key

like this:

dict={'windows':['win 7','xp','NT'],'linux':['ubuntu','fedora','mint'}
and if user enter win 7

it returns windows and so on

Answer 3

well you can do it, but you're implementing dictionaries wrong..

platform = {'windows' : ['win 7', 'xp', 'NT'], 'linux' : ['ubuntu', 'fedora', 'mint']}

user_input = "xp"
keys = platform.keys()
for x in keys:
for y in platform[x]:
if y == user_input:
print user_input

I recommend that you restructure the dictionary, so that the versions or distros can be the indexes.

Answer 4

thanks axl456

okk so now you know that this is the scene

how would you use dict in this case?

i could not understand the last line

Answer 5

you could use them like this:

operating_system = {"xp" : ["windows",], "win 7" : ["windows",], "NT" : ["windows",],
"ubuntu" : ["linux",], "fedora" : ["linux",], "mint" : ["linux",]}



in this case every windows version or linux distro is an individual entry in the dict.

This way you can add more info to every entry:

operating_system = {"xp" : ["windows", "2001", "128 MB RAM", "1.5 GB"]...

and use the OS as index, so if the user type "xp" you could just do this:

operating_system[user_input]

Answer 6

thanks bro..
well i want to very familiar with dictionary and list its mutations

how can i do that is there any book or something

its really tough to make simple projects for beginners because as a programmer of C

i know what i want to do but i can't implement it in python

Answer 7

well for python theres A LOT of book, videos, tutorial, etc etc on the internet..

the one I recommend most is this:
http://www.amazon.com/Learning-Python-Powerful-Object-Oriented-Programming/dp/0596158068

Answer 8

thanks but i dont have credit card yet..
:(

well where can i find videos apart from MIT 6.0

Answer 9

i have one book of python

beginning python (wrox publication)

is it good enough?

Answer 10

I havent seen this videos yet, but they look good:

http://code.google.com/edu/languages/google-python-class/

this is the one of dict:
http://www.youtube.com/watch?v=haycL41dAhg

Answer 11

thanks bro

thanks a lot..
:)

do you have facebook a/c?

Answer 12

yes, I never use it but I have one.. is /Fidel.sanchez.bueno

Answer 13

thanks

well the google video starts from part3

i wondor where are the other 2 parts from day1

Answer 14

http://code.google.com/edu/languages/google-python-class/

on the left in "Lecture Videos"