How to use the get() method of a dictionary In Python
The get() method returns the value for a given key if it exists in the dictionary. If the key does not exist, it returns None. You can use this behavior to check if a value exists in the dictionary by checking if it is in the list returned by values().
Python3
test_dict = {'gfg': 1, 'is': 2, 'best': 3}if 21 in test_dict.values(): print(f"Yes, It exists in dictionary")else: print(f"No, It doesn't exist in dictionary") |
No, It doesn't exist in dictionary
Time complexity: O(n)
Auxiliary space: O(1)
Using isinstance() function:
Approach:
Check if the input value is of dictionary type or not.
If it is, check if the given element exists in any of the dictionary values.
If yes, return True. Else, return False.
Python3
def check_dict_value_1(d, val): if isinstance(d, dict): return any(val == v for v in d.values()) return Falsemy_dict = {'a': 1, 'b': 2, 'c': {'d': 3, 'e': 4}, 'f': 5}my_value = 4result = check_dict_value_1(my_dict, my_value)print(result) |
False
Time Complexity: O(n)
Auxiliary Space: O(1)
Python | Test if element is dictionary value
Sometimes, while working with a Python dictionary, we have a specific use case in which we just need to find if a particular value is present in the dictionary as it’s any key’s value. This can have use cases in any field of programming one can think of. Let’s discuss certain ways in which this problem can be solved using Python.
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