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
Tag: with-statement
Why does calling the __exit__ method on unittest.mock._patch throw an IndexError?
When I define a function and patch it using the with statement it runs fine. Output: My understanding is that using the with statement would cause the __enter__ and __exit__ methods to be called on the patch object. So I thought that would be equivalent to doing this: The output from the some_func call is the same in this case:
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
Is it possible to have an optional with/as statement in python?
Instead of this: it’s better to use this: What if I have something like this? Where do_something also has an “if FILE is None” clause, and still does something useful in that case – I don’t want to just skip do_something if FILE is None. Is there a sensible way of converting this to with/as form? Or am I just
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