如何在字典中查找仅包含列表中所有值的所有键

Question

i'am new in python. I Am currently working on a script that filters job applicants by which programing languages they use. I've a dictionary containing each candidate (keys) and her language (value). I want to find ONLY the keys within a dictionary whose values contains ALL items contained in a list. For example:

list1 = ['php', 'net']
dict  = {
    'lara': ['net', 'php', 'python'], 
    'john': ['php', 'c++'], 
    'ian' : ['php','python']}

Using this example what i want to get would be only the key 'lara', which is the only one containing all the values listed within list1. I've searched like mad for a solution to this problem but so far i've found nothing around and neither could make it work for myself.

Any help will be welcome

Answer 1

Using a list comprehension and all

list1 = ['php', 'net']
d = {'lara': ['net', 'php', 'python'], 'john': ['php', 'c++'], 'ian': ['php','python']}
print([k for k,v in d.items() if all(i in v for i in list1)])

Output:

['lara']

Expanded version.

res = []
for k,v in d.items():
    if all(i in v for i in list1):
        res.append(k)

Answer 2

Use a list or dict comprehension to filter the elements in the dictionary (renamed dict to dikt below to avoid clashing with the dict class). The all function returns True if all elements of the iterable are True .

list1 = ['php', 'net']
dikt = {'lara': ['net', 'php', 'python'], 'john': ['php', 'c++'], 'ian': ['php','python']}

# Matching keys as a list:

[k for k,v in dikt.items() if all(x in v for x in list1)]
# ['lara']

# Matching entries returned as a dict:

{k:v for k,v in dikt.items() if all(x in v for x in list1)}
# {'lara': ['net', 'php', 'python']}

Answer 3

Use set.isubset method to find if the given set is subset of the lists

list1=['php', 'net']
dict1={'lara': ['net', 'php', 'python'], 'john': ['php', 'c++'], 'ian': ['php','python']}
set1=set(list1)
{k:v for k,v in dict1.items() if set1.issubset(v)}
# {'lara': ['net', 'php', 'python']}

Answer 4

Use sets instead of lists.

set1 = {'php', 'net'}
dict1 = {'lara': ['net', 'php', 'python'], 'john': ['php', 'c++'], 'ian': ['php','python']}
{k: v for k,v in dict1.items() if set1.issubset(v)}