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In python... I have a list of elements 'my_list', and a dictionary 'my_dict' where some keys match in 'my_list'.
I would like to search the dictionary and retrieve key/value pairs for the keys matching the 'my_list' elements.
I tried this...
if any(x in my_dict for x in my_list):
print set(my_list)&set(my_dict)
But it doesn't do the job.
878
The methods dict. keys() and dict. values() return lists of the keys or values explicitly. There's also an items() which returns a list of (key, value) tuples, which is the most efficient way to examine all the key value data in the dictionary.
Check if a key-value pair exists in a dictionary: in operator, items() To check if a key-value pair exists in a dictionary, i.e., if a dictionary has/contains a pair, use the in operator and the items() method. Specify a tuple (key, value) . Use not in to check if a pair does not exist in a dictionary.
A value in the key-value pair can be a number, a string, a list, a tuple, or even another dictionary.
Don't use dict and list as variable names. They shadow the built-in functions. Assuming list l and dictionary d:
kv = [(k, d[k]) for k in l if k in d]
(I renamed list to my_list and dict to my_dict to avoid the conflict with the type names.)
For better performance, you should iterate over the list and check for membership in the dictionary:
for k in my_list:
if k in my_dict:
print(k, my_dict[k])
If you want to create a new dictionary from these key-value pairs, use
new_dict = {k: my_dict[k] for k in my_list if k in my_dict}
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