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You can test if a number of keys are in a dict by taking advantage that <dict>. keys() returns a set . The <= operator for sets tests for whether the set on the left is a subset of the set on the right. Another way of writing this would be <set>.
For example, you can use an integer, float, string, or Boolean as a dictionary key. However, neither a list nor another dictionary can serve as a dictionary key, because lists and dictionaries are mutable.
Method 3: Check If Key Exists using has_key() method Using has_key() method returns true if a given key is available in the dictionary, otherwise, it returns a false. With the Inbuilt method has_key(), use the if statement to check if the key is present in the dictionary or not.
You cannot use a list as a key because a list is mutable. Similarly, you cannot use a tuple as a key if any of its elements are lists. (You can only use a tuple as a key if all of its elements are immutable.)
How can I determine if any of the list elements are a key to a dict? The straight forward way is,
for i in myList:
if i in myDict:
return True
return False
but is there a faster / more concise way?
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