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Python variable name resolution eval() exec() functions, python 3.11.0 docs
By Guest on 4th November 2022 07:27:36 AM | Syntax: PYTHON | Views: 185


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  1. 4.2. Naming and binding
  2. =======================
  3.  
  4. 4.2.4. Interaction with dynamic features
  5. ----------------------------------------
  6.  
  7. Name resolution of free variables occurs at runtime, not at compile
  8. time. This means that the following code will print 42:
  9.  
  10.    i = 10
  11.    def f():
  12.        print(i)
  13.    i = 42
  14.    f()
  15.  
  16. The "eval()" and "exec()" functions do not have access to the full
  17. environment for resolving names.  Names may be resolved in the local
  18. and global namespaces of the caller.  Free variables are not resolved
  19. in the nearest enclosing namespace, but in the global namespace.  [1]
  20. The "exec()" and "eval()" functions have optional arguments to
  21. override the global and local namespace.  If only one namespace is
  22. specified, it is used for both.
  23.  
  24. Related questions:
  25. What is eval and exec in Python?
  26. What is exec () in Python?
  27. What does eval () do in Python?
  28. How do you use eval?
  29.  
  30.  
  31. Related video:
  32. Be Careful When Using exec() or eval() in Python
  33. https://www.youtube.com/watch?v=keSvLnLNep4
















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