In some languages, class variables and class methods are either statically resolved, not via dynamic dispatch, or their memory statically allocated at compile time (once for the entire class, as static variables), not dynamically allocated at run time (at every instantiation of an object).
Thus in some languages, static member variable or static member function are used synonymously with or in place of "class variable" or "class function", but these are not synonymous across languages.
These terms are commonly used in Java, C#,[5] and C++, where class variables and class methods are declared with the static keyword, and referred to as static member variables or static member functions.
Since count is a class variable, there is only one object Request::count; in contrast, each Request object contains its own distinct number field.
In the above Python code, it does not provide much information as there is only class variable in the Dog class that provide the vertebrate group of dog as mammals.