How do I detect whether a variable is a function?

In Python, you can use the built-in callable() function to check if a variable is a function. Here is an example code snippet:

def my_function():
    pass

var1 = my_function

if callable(var1):
    print("var1 is a function")
else:
    print("var1 is not a function")

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Note that callable will return True for all callable objects, including classes, instances with call methods, and built-in functions.