Check if a python function is builtin
103649
Python - test whether object is a builtin function
39799
Does the `is` operator use a __magic__ method in Python?
1727
How to determine function name from inside a function
2267
How to detect if a script is being sourced
53586
How can I type-check variables in Python?
44105
How to detect if a program has been compiled using -threaded?
104809
How can I read a function's signature including default argument values?
126869
Listing defined functions in Bash
65130
How can I see the source of built-in JavaScript functions?
122819
How to check if a DLL file is registered?
93047
How to check whether a variable is a class or not?
74254
How to distinguish between builtin and external util? (e.g. echo)
3247
How can I find the number of arguments of a Python function?
37773
How do I detect whether a Python variable is a function?
51946
How can I find unused functions in a PHP project
148248
Check if object is Class type
41152
Function with custom Options and modified Options for built-in Symbols