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Python name binding, assignments and import statements, scope (global vs local) Python 3.11
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  1. 4.2.1. Binding of names
  2. -----------------------
  3.  
  4. *Names* refer to objects.  Names are introduced by name binding
  5. operations.
  6.  
  7. The following constructs bind names:
  8.  
  9. * formal parameters to functions,
  10.  
  11. * class definitions,
  12.  
  13. * function definitions,
  14.  
  15. * assignment expressions,
  16.  
  17. * targets that are identifiers if occurring in an assignment:
  18.  
  19.   * "for" loop header,
  20.  
  21.   * after "as" in a "with" statement, "except" clause, "except*"
  22.     clause, or in the as-pattern in structural pattern matching,
  23.  
  24.   * in a capture pattern in structural pattern matching
  25.  
  26. * "import" statements.
  27.  
  28. The "import" statement of the form "from ... import *" binds all names
  29. defined in the imported module, except those beginning with an
  30. underscore. This form may only be used at the module level.
  31.  
  32. A target occurring in a "del" statement is also considered bound for
  33. this purpose (though the actual semantics are to unbind the name).
  34.  
  35. Each assignment or import statement occurs within a block defined by a
  36. class or function definition or at the module level (the top-level
  37. code block).
  38.  
  39. If a name is bound in a block, it is a local variable of that block,
  40. unless declared as "nonlocal" or "global".  If a name is bound at the
  41. module level, it is a global variable.  (The variables of the module
  42. code block are local and global.)  If a variable is used in a code
  43. block but not defined there, it is a *free variable*.
  44.  
  45. Each occurrence of a name in the program text refers to the *binding*
  46. of that name established by the following name resolution rules.
  47.  
  48. See also:
  49. Python Classes and Objects >> Python Binding a Name to an Object
  50. https://www.youtube.com/watch?v=-f7GfXPr8CE
















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