使用列表中的值查找字典键

Question

i'm trying to find a element in a list and return the the key who has that list. Example:

mydict = {'hi':[1,2], 'hello':[3,4]}

print(find(1))
return 'hi

Is there any simple way to do it?

Answer 1

This function will return all the keys that contain the given value as a list.

def find(to_find, inp_dct):
    return [i for i in inp_dct if to_find in inp_dct[i]] 

Answer 2

for k in mydict:
    if val in mydict[k]:
        print(k)

Where val is the value you want to find.

Answer 3

You can simply loop through your dictionary as key,value pairs and your search value is in values list, it will return the value.

Code:

mydict = {'hi':[1,2], 'hello':[3,4]}

def find(item):
    for key, value in mydict.items():
        if item in value:
            return key
        
print(find(1))

Output: hi