Determine if variable is defined in Python
102826
Easy way to check that a variable is defined in python?
5307
Check if a variable is in an ad-hoc list of values
87568
How to find where a method is defined at runtime?
1727
How to determine function name from inside a function
14256
How to form a regex to recognize correct declaration of variable names
13918
Accessing class variables from a list comprehension in the class definition
50773
How to determine the type of a variable in Swift
5846
Python : Assert that variable is instance method?
35503
Understanding Python's "is" operator
37773
How do I detect whether a Python variable is a function?
143126
Is it possible to check where an alias was defined?
53203
Checking for undefined
19252
Determine original name of variable after its passed to a function
83782
How to check a not-defined variable in JavaScript
29612
How to find the name of a variable that was passed to a function?
317
What is the scope of variables in JavaScript?
39799
Does the `is` operator use a __magic__ method in Python?