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The Zen of Python is a collection of 19 'guiding principles' for writing computer programs that influence the design of the Python programming language. [1] Python code that aligns with these principles is often referred to as 'Pythonic'.
The double colon ( :: ) may refer to: an analogy symbolism operator, in logic and mathematics a notation for equality of ratios a scope resolution operator, in computer programming languages
O Operand Operator associativity Operator overloading Operators in C and C++ Order of operations P Polish notation R Range operator Relational operator Reverse Polish notation S Safe navigation operator Scope resolution operator Sizeof T Ternary conditional operator Three-way comparison Type conversion Typeof U Unary operation User-defined operator
In many languages, the scope resolution operator is written ::. In some languages, notably those influenced by Modula-3 (including Python and Go), modules are objects, and scope resolution within modules is a special case of usual object member access, so the usual method operator . is used for scope resolution.
Scope is an important component of name resolution, [d] which is in turn fundamental to language semantics. Name resolution (including scope) varies between programming languages, and within a programming language, varies by type of entity; the rules for scope are called scope rules (or scoping rules). Together with namespaces, scope rules are crucial in modular programming, …
Instead, the name of the parent or base class is used followed by the scope resolution operator. For example, the following code presents two classes, the base class Rectangle, and the derived class Box.
Python syntax and semantics A snippet of Python code with keywords highlighted in bold yellow font The syntax of the Python programming language is the set of rules that defines how a Python program will be written and interpreted (by both the runtime system and by human readers). The Python language has many similarities to Perl, C, and Java.
Languages with dynamic scope resolution sacrifice this safety for more flexibility; they can typically set and get variables in the same scope at runtime. For example, in the Python interactive REPL:
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