Python: How can I run eval() in the local scope of a function

by

Save the result of locals() (or vars()) call to return the function’s local scope. Otherwise, locals() inside the generator expression will return the gen-expr’s local scope.

def test3():
    lvar1 = 1
    lvar2 = 2
    lvar3 = 3
    scope = locals()
    myDict = dict((name, eval(name, scope)) for name in [
                  "lvar1", "lvar2", "lvar3"])
    print(myDict["lvar1"])

BTW, you don’t need an explicit comprehension to build that dict:

# copy() avoids quirky, unexpected updates if something else (like a debugger)
# accesses locals() or f_locals
myDict = locals().copy()  # or vars().copy()

More Related Contents:

  1. Short description of the scoping rules?
  2. Why is using ‘eval’ a bad practice?
  3. Local variables in nested functions
  4. Accessing class variables from a list comprehension in the class definition
  5. What’s the difference between eval, exec, and compile?
  6. Python 3: UnboundLocalError: local variable referenced before assignment [duplicate]
  7. What does Python’s eval() do?
  8. Security of Python’s eval() on untrusted strings?
  9. How to access outer class from an inner class?
  10. Why does this UnboundLocalError occur (closure)? [duplicate]
  11. Python eval: is it still dangerous if I disable builtins and attribute access?
  12. How do I pass variables across functions?
  13. How to create module-wide variables in Python? [duplicate]
  14. String with ‘f’ prefix in python-3.6
  15. How to inject variable into scope with a decorator?
  16. globals and locals in python exec()
  17. Why is one class variable not defined in list comprehension but another is?
  18. Getting “global name ‘foo’ is not defined” with Python’s timeit
  19. How references to variables are resolved in Python [duplicate]
  20. Why does ast.literal_eval(‘5 * 7’) fail?
  21. Nested list comprehension scope
  22. Global dictionaries don’t need keyword global to modify them? [duplicate]
  23. Why do I get a `NameError` (or `UnboundLocalError`) from using a named exception after the `except` block?
  24. UnboundLocalError trying to use a variable (supposed to be global) that is (re)assigned (even after first use)
  25. How do the scoping rules work with classes?
  26. Python global variable scoping
  27. eval fails in list comprehension [duplicate]
  28. Why is Python’s eval() rejecting this multiline string, and how can I fix it?
  29. Running Python code contained in a string
  30. How can I access global variable inside class in Python

Leave a Comment