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Python Glossary: terms starting with letter H
By Guest on 13th November 2022 08:04:08 AM | Syntax: PYTHON | Views: 188


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  1. Glossary - H
  2. ********
  3.  
  4. hash-based pyc
  5.    A bytecode cache file that uses the hash rather than the last-
  6.    modified time of the corresponding source file to determine its
  7.    validity. See Cached bytecode invalidation.
  8.  
  9. hashable
  10.    An object is *hashable* if it has a hash value which never changes
  11.    during its lifetime (it needs a "__hash__()" method), and can be
  12.    compared to other objects (it needs an "__eq__()" method).
  13.    Hashable objects which compare equal must have the same hash value.
  14.  
  15.    Hashability makes an object usable as a dictionary key and a set
  16.    member, because these data structures use the hash value
  17.    internally.
  18.  
  19.    Most of Python's immutable built-in objects are hashable; mutable
  20.   containers (such as lists or dictionaries) are not; immutable
  21.   containers (such as tuples and frozensets) are only hashable if
  22.   their elements are hashable.  Objects which are instances of user-
  23.   defined classes are hashable by default.  They all compare unequal
  24.   (except with themselves), and their hash value is derived from
  25.   their "id()".
















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