Python hex() function is used to generate hex value of an integer argument. It takes an integer argument and returns an integer converted into a hexadecimal string. In case, we want to get a hexadecimal value of a float, then use float.hex() function. Show Python hex() Function Example
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Python hash() FunctionPython hash() function is used to get the hash value of an object. Python calculates the hash value by using the hash algorithm. The hash values are integers and used to compare dictionary keys during a dictionary lookup. We can hash only the types which are given below: The Example
hash() SyntaxThe syntax of hash(object) hash() ParametersThe
hash() Return ValueThe Example 1: How hash() works in Python?
Output Hash for 181 is: 181 Hash for 181.23 is: 530343892119126197 Hash for Python is: 2230730083538390373 Example 2: hash() for immutable tuple object?
Output The hash is: -695778075465126279 How does hash() work for custom objects?As stated above, hash(object)4 method. So, any objects can override hash(object)4 for custom hash values. But for correct hash implementation, hash(object)4 should always return an integer. And, both hash(object)7 and hash(object)4 methods have to be implemented. Below are the cases for correct hash(object)4 override. __eq__()__hash__()DescriptionDefined (by default)Defined (by default)If left as is, all objects compare unequal (except themselves)(If mutable) DefinedShould not be definedImplementation of hashable collection requires key's hash value be immutableNot definedShould not be definedIf hash(object)7 isn't defined, hash(object)4 should not be defined.DefinedNot definedClass instances will not be usable as hashable collection. __hash__() implicity set to 2. Raises 3 exception if tried to retrieve the hash.DefinedRetain from Parent 4DefinedDoesn't want to hash 5. Raises TypeError exception if tried to retrieve the hash.Example 3: hash() for Custom Objects by overriding __hash__()
Output The hash is: 3785419240612877014 Note: You don't have to implement hash(object)7 method for the hash as it is created by default for all objects. |