PyTermGUI provides a pretty nifty inspection utility, inspect! It's useful to figure out the signature of functions, inspect their general shape & docstrings.
The easiest way to use it is by running ptg -i or ptg --inspect with a fully qualified name. This will create an Inspector object for the given name, and print it.
You can also give the same function an expression to evaluate. This might be useful if you want to know the type & methods of an object that is the result of some function or method.
The more general way to access the API is by using the inspect function from within Python. You can give it any object, and it will give you as much information as it can found out from the signature & source code. You can also play around with an interactive version of the tool by running ptg --app inspect, which will give you a nice UI to play around with.