how to check if a value is in a dictionary key python 3 code example

Example 1: python check if value exists in any key

>>> d = {'1': 'one', '3': 'three', '2': 'two', '5': 'five', '4': 'four'}
>>> 'one' in d.values()
True

Example 2: python dictionary get value if key exists

val = dict.get(key , defVal)  # defVal is a default value if key does not exist