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Tag: with-statement

Function failing to update spacing after comma

I have a csv file that has inconsistent spacing after the comma, like this: 534323, 93495443,34234234, 3523423423, 2342342,236555, 6564354344 I have written a function that tries to read in the file and makes the spacing consistent, but it doesn’t appear to update anything. After opening the new file created, there is no difference from the original. The function I’ve written

Invoking a constructor in a ‘with’ statement

I have the following code: Running it produces the following output: But I expected it to produce: Why isn’t the code within my first example called? Answer The __enter__ method should return the context object. with … as … uses the return value of __enter__ to determine what object to give you. Since your __enter__ returns nothing, it implicitly returns

Execute code line by line interactively in console inside `with` block

When testing things interactively in a console, sometimes I use with statements. However, because they increase indentation, the prompt changes from >>> to … and the execution stops until I return to the lowest indentation. It makes sense for function definitions, because the code isn’t actually executed inside the function definition. But then there are loops (first iteration could be

Why can’t a module be a context manager (to a ‘with’ statement)?

Suppose we have the following mod.py: and the following use of it: I get an error: According to the documentation the documentation the with statement should execute as follows (I believe it fails at step 2 and therefore truncate the list): The context expression (the expression given in the with_item) is evaluated to obtain a context manager. The context manager’s

Python with statement in C++

I am trying to implement something similar to the Python with statement in C++. As I plan to use it mainly with Qt-OpenGL the methods are called bind and release (in Python __enter__, __exit__). Code I came up with: header: cpp: Usage: Questions: Needing class A and class B feels a bit clumsy. Is there a better alternative? Are there

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