Check nested dictionary values?

Question

For a large list of nested dictionaries, I want to check if they contain or not a key. Each of them may or may not have one of the nested dictionaries, so if I loop this sea

Answer 1

Here's a generalization for an arbitrary number of keys:

for Dict1 in DictionariesList:
    try: # try to get the value
        reduce(dict.__getitem__, ["Dict2", "Dict3", "Dict4"], Dict1)
    except KeyError: # failed
        continue # try the next dict
    else: # success
        print("Yes")

Based on Python: Change values in dict of nested dicts using items in a list.