python max function using ‘key’ and lambda expression

I come from OOP background and trying to learn python. I am using the max function which uses a lambda expression to return the instance of type Player having maximum totalScore among the list players. The function correctly returns instance of type Player having maximum totalScore. I am confused about the following three things: How does the max function work? What are the arguments it is taking? I looked at the documentation but failed to understand. What is use of the keyword key in max function? I know it is also used in context of sort function Meaning of the

Passing an integer by reference in Python

How can I pass an integer by reference in Python? I want to modify the value of a variable that I am passing to the function. I have read that everything in Python is pass by value, but there has to …

How to check whether optional function parameter is set

Is there an easy way in Python to check whether the value of an optional parameter comes from its default value, or because the user has set it explicitly at the function call?

Why do function objects evaluate to True in python?

In python it is valid to make a construction like: def a(): return 0 if a: print “Function object was considered True” else: print “Function object was considered False” I wish to …

Using a dictionary to select function to execute

I am trying to use functional programming to create a dictionary containing a key and a function to execute: myDict={} myItems=(“P1″,”P2″,”P3″,….”Pn”) def myMain(key): def ExecP1(): …

How can I make a deepcopy of a function in Python?

I would like to make a deepcopy of a function in Python. The copy module is not helpful, according to the documentation, which says: This module does not copy types like module, method, stack …

What is the best way to exit a function (which has no return value) in python before the function ends (e.g. a check fails)?

Let’s assume an iteration in which we call a function without a return value. The way I think my program should behave is explained in this pseudocode: for element in some_list: foo(element) def …