python KeyError: 7

This error occurs when you try to access a key that does not exist in a dictionary. In this case, the key "7" is not present in the dictionary.

For example:

my_dict = {1: "one", 2: "two", 3: "three"}
print(my_dict[7])

This will result in a KeyError because the key "7" does not exist in the dictionary. To avoid this error, you should check if the key exists before accessing it:

if 7 in my_dict:
    print(my_dict[7])
else:
    print("Key does not exist in dictionary")