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 the nested function. If the definition is not found there, Python will next
Tag: scope
pass one function to another, where inner function may access variable in the larger function, python
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: The problem is that sometimes the user’s function may not need
Python: Function scope inside a class
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”]. I read that when a function is nested inside a class, Python will use variables defined in the module scope and
Confusion about scoping in python classes
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 three nested scopes whose namespaces are directly accessible: – the innermost scope, which
How to make a variable inside a try/except block public?
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 probably want the print(text) line in an
How to access outer class from an inner class?
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 created an instance of the