skazhy a écrit :
hi, i am new to python, so i've a really simple question about
dictionaries.
if i have a dictionary and I make have an input after it (to input
numbers) can i get the key of value that was in input?
What if many keys are associated with a same value, ie:
d = {'a':100, 'b':200, 'c':100}
somehting like this:
dict = { "key1"=100,"key2"=200,"key3"=300}
1/ don't use 'dict' as an indentifier - this shadows the builtin dict type.
2/ the 'dict literal' syntax is:
d = {'key1":100, "key2": 200, "key3":300}
a = input()
print 'the key of inputted value is', dict['a']
>
this syntax of course is wrong, but i hope you got the point..
Assuming you don't have duplicate values, you just need to build a
reverse dictionnary, that is using values as keys and keys as values,
then lookup this dictionnary. The first operation can be done in one
single line.
reversed_d = dict((value, key) for key, value in d.items())
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