How to tell PyCharm that a function parameter is an instance of something ?

The question is simple but you must excuse me if I start with a long preamble. Let's say I have a class and a function that accepts an instance of this class as a parameter. For example:

class Person(object):
    """ This class defines a person """
   
    def __init__(self, P_cSecondName = "", P_cFirstName = ""):
        self.firstname = P_cFirstName
        self.secondname = P_cSecondName

def greet(P_objPerson):
    """ This function greets a person """
   
    print("Hi")

clark = Person("Kent", "Clark")
greet(clark)

>>> Hi

Now I want to use the properties of the class "Person" to greet this guy, so inside the function instead of:

print("Hi")

I'm writing:

print("Hi {0} !".format(P_objPerson.firstname))

>>> Hi Clark !

It's simple. What is my problem then? If I don't remember the properties and methods of the "Person" class, how do I ask PyCharm to give me a list of them? Basically I would like to write in the source code the word "P_objPersona", press the dot key and see a pop-up window with the lists of each property and each method available inside the class "Person".

For example in WingIDE I can write:

def greet (P_objPerson):
     isinstance (P_objPerson, Person)
     ...

WingIDE automatically recognize that when I wrote P_objPerson I'm referring to an instance of the class "Person", but on PyCharm I tried to do the same and it doesn't work.

So, finally, my question is: On PyCharm how do you do that?


Many thanks and best regards