检查字典值是否在字符串中，输出=键

Question

Python 3.4

Let's say I've got a dictionary:

dict = { "one" : ["abcdefg", "hij"], "two" : ["klmnopq"], "three" : ["rstuvwx", "zyx"] }

And I've also got a string:

string = "XXXabcdefgXXXhijXXXXXklmnopqXXXXXXzyxXXXXzyxXXXXX" 

...where "X" stands for other random unimportant letters.

I want to check if the a VALUE of the dictionary is in the string (eg if "hij" can be found in String), and if it is, then I want an output that creates a list of all of the different items found in the string.

Something like this:

list = []
if dict.value in string:
    list.append(dict.key)
print(list) --> ["one", "one", "two", "three", "three"]

What would be the best way to get this sort of result?

Answer 1

You're very close, you have the logic correct and are just missing the loops.

In the outer loop, you need to loop through the keys in the dictionary.

for key in dict.keys():

In the inner loop, you need to loop through each element in the value list.

for value in dict[key]:

Here is the full code:

key_list = []
for key in dict.keys():
    for value in dict[key]:
        if value in string:
            key_list.append(key)
print(key_list)

One other thing to note is that dictionaries do not hold an order, so your result will not be sorted as you would expect.