Ruby: kind_of? vs. instance_of? vs. is_a?

kind_of? and is_a? are synonymous. instance_of? is different from the other two in that it only returns true if the object is an instance of that exact class, not a subclass. Example: “hello”.is_a? Object and “hello”.kind_of? Object return true because “hello” is a String and String is a subclass of Object. However “hello”.instance_of? Object returns … Read more

Finding what methods a Python object has

For many objects, you can use this code, replacing ‘object’ with the object you’re interested in: object_methods = [method_name for method_name in dir(object) if callable(getattr(object, method_name))] I discovered it at diveintopython.net (now archived), that should provide some further details! If you get an AttributeError, you can use this instead: getattr() is intolerant of pandas style … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)