JRFunctions References

The following topics provide useful reference information for system-defined functions. Some of these functions are grouped into categories to help you find the right function for your task:

Functions that return a string representing an object.

The string is enclosed in angle brackets and may include a list of property values for the object. The resulting string may also contain attributes or other properties set by the class that defines the function.

Invoke the built-in help system. If the argument is a string, the name of a module, function, class, method, keyword, or documentation topic is looked up and a help page is displayed on the interpreter console. If the argument is any other kind of object, a help page is displayed for that object instead.

Return a number rounded to the integer closest to the given number of digits. If the argument is a float, the returned value is the same as a float converted to a string using str(float) and str(round(float)) with an optional leading zero.

A variadic parameter accepts an arbitrary number of input values when the function is called. You write a variadic parameter by inserting three period characters (...) after the parameter's type name. Variadic parameters must have unique argument labels to make your code more readable.

An iterator function that returns a reverse iterator. The argument must be a collection object that supports the iterable protocol (the __iter__() method) or the sequence protocol (the __getitem__() method with integer arguments starting at 0). If the object is not an iterator, this function raises TypeError.