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I tried searching internet but could not find the meaning of hashable.
When they say objects are hashable or hashable objects what does it mean?
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Hashable data types: int , float , str , tuple , and NoneType .
An object is said to be hashable if it has a hash value that remains the same during its lifetime.
Hashable. 00:00 Immutable objects are a type of object that cannot be modified after they were created. Hashable objects, on the other hand, are a type of object that you can call hash() on.
A function is hashable because it is a normal, builtin, non mutable object. From the Python Manual: An object is hashable if it has a hash value which never changes during its lifetime (it needs a __hash__() method), and can be compared to other objects (it needs an __eq__() or __cmp__() method).
From the Python glossary:
An object is hashable if it has a hash value which never changes during its lifetime (it needs a
__hash__()method), and can be compared to other objects (it needs an__eq__()or__cmp__()method). Hashable objects which compare equal must have the same hash value.Hashability makes an object usable as a dictionary key and a set member, because these data structures use the hash value internally.
All of Python’s immutable built-in objects are hashable, while no mutable containers (such as lists or dictionaries) are. Objects which are instances of user-defined classes are hashable by default; they all compare unequal, and their hash value is their
id().
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