[Python] How to print the subkey if it has a value [closed]

Greeting, I only want to print the subkey(s) if it has a value. Below is my code:

my_dict = {
'a': {
'subkey_a': 1
},
'b': 2,
'c': {
'subkey_c': 3
},
'd': {
'subkey_d': ''
}
}

for key, value in my_dict.items():
if isinstance(value, dict) and value != '':
print(f"Key '{key}' has subkeys and values") # subkey_d should not be printed!


I don't want to print the subkey_d since there is no value. The output:

Key 'a' has subkeys and values
Key 'c' has subkeys and values
Key 'd' has subkeys and values


what I did wrong?

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