如何比较两个不同字典中相同键的值

Question

I'm sure this has been asked, my apologies for the duplication but I can't find an answer. I need to compare two dictionaries containing the same keys but separate values (inventory management with thousands of items). I can find pairs, which is helpful, but I need an expression that returns the value of a key in dictionary B when it is lower than the same key in dictionary A. Here is what I have so far:

dictionary1 = {'A':7, 'B':8, 'C':9}

dictionary2 = {'A':2, 'B':8, 'C':22}

pairs = dict()

for key in dictionary1:
    if key in dictionary2 and dictionary1[key] ==dictionary2[key]:

        pairs[key] = dictionary1[key]

print(pairs)

{'B': 8}

Process finished with exit code 0

Answer 1

You might want to take a look at deepdiff.DeepDiff to find any changes in your dictionary (even on multiple levels):

from deepdiff import DeepDiff
dict_a = {'A':7, 'B':8, 'C':9}
dict_b = {'A':2, 'B':8, 'C':22}
dd = DeepDiff(dict_a, dict_b)

output:

{'values_changed': {"root['A']": {'new_value': 2, 'old_value': 7}, "root['C']": {'new_value': 22, 'old_value': 9}}}