Definition: Reusability mechanism for sharing code from one module to an- other. Pros: The namespace management convention is simple. The source of each identifier is indicated in a consistent way; x.Obj says preferable to if len(seq): or if not len(seq):. • When handling integers, implicit false may involve more risk than benefit (i.e., accidentally handling None as 0). You may compare a value which is known to be will actually run the file’s destructor. Different Python implementations use different memory management techniques, such as delayed Garbage Collection, which may increase the object’s lifetime arbitrarily

simpler, safer, and more general. Unlike when passing objects by pointer or reference, there’s no risk of confusion over ownership, lifetime, mutability, and similar issues, and no need to specify them {} // Bad, defines only move constructor, but not operator=. private: Field field_; }; Due to the risk of slicing, avoid providing an assignment operator or public copy/move constructor for a class that’s semantics of the built-in operators. • Operators are often defined outside the class, so there’s a risk of different files introducing different definitions of the same operator. If both defini- tions are

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