Tag: scope

Are these `.` attribute bindings necessary in the implementation of `functools.partial`?

docs.python.org says that functools.partial is roughly equivalent to: (Note: / is used to denote func as a positional-only argument of partial. See [1].) If I understand correctly, when a variable is referenced within a nested function, such as newfunc, Python first looks for the variable definition within th…

pass one function to another, where inner function may access variable in the larger function, python

function python scope

I have a library function to which a user can pass their own function that will be executed at various points during the library function’s execution. Sometimes, these user functions may want to access (not modify) variables that only exist inside the library function. This is the current implementation…

Python: Function scope inside a class

class function oop python scope

Let’s consider the code below. On first look, one might expect list_1 and list_2 to both have the same content: [“Tom”, “Tom”], but this is not the case. list_1 evaluates to [“Tom”, “Tom”], whereas list_2 evaluates to [“John”, “John&#8221…

Confusion about scoping in python classes

python scope self

I am currently reviewing the python tutorials of python.org. I come from C++ and in the Classes tutorial (https://docs.python.org/3/tutorial/classes.html) I see that the scoping is similar to that in C++. It says the following about scoping and nesting: “At any time during execution, there are at least …

How to make a variable inside a try/except block public?

python python-3.x scope try-except

How can I make a variable inside the try/except block public? This code returns an error How can I make the variable text available outside of the try/except block? Answer try statements do not create a new scope, but text won’t be set if the call to url lib.request.urlopen raises the exception. You pro…

How to access outer class from an inner class?

inner-classes nested python scope

I have a situation like so… How can I access the Outer class’s method from the Inner class? Answer The methods of a nested class cannot directly access the instance attributes of the outer class. Note that it is not necessarily the case that an instance of the outer class exists even when you have…