Circular imports cause problems, but Python has ways to mitigate it built-in. The problem is when you run python a.py, it runs a.py but not mark it imported as a module. So in turn a.py-> imports module b -> imports module a -> imports module b. The last import a no-op since b is currently being imported and Python guards against that.

Jan 2, 2012 · The default namespace in Python is "__main__". When you use import scipy , Python creates a separate namespace as your module name. The rule in Pyhton is: when you want to call an attribute from another namespaces you have to …

Nov 24, 2011 · AttributeError: 'module' object has no attribute 'function_name' is because module does not have a variable named function_name in its namespace. It does have a variable named Classname however.

These kind of bugs are common when Python multi-threading. What happens is that, on interpreter tear-down, the relevant module ( myThread in this case) goes through a sort-of del myThread . The call self.sample() is roughly equivalent to myThread.__dict__["sample"](self) .

Aug 29, 2013 · When you import lib, you're importing the package.The only file to get evaluated and run in this case is the 0 byte __init__.py in the lib directory.

Sep 28, 2015 · Please do post a full traceback for Python errors. For this case, for example, the fact that set_marker() is called from __init__ is a crucial clue as to what is going wrong, the traceback would show that.

This is a special case of AttributeErrors. It merits separate treatment because there are a lot of ways to get an unexpected None value from the code, so it's typically a different problem; for other AttributeErrors, the problem might just as easily be the attribute name.

Python allows for huge amounts of customization of the import system. Aside from that, it would be a terrible default behaviour, because in most cases it would slow down all the top-level imports in order to import huge amounts of code that isn't actually used later.

Jul 19, 2018 · Traceback (most recent call last): File "test44.py", line 156, in <module> with ParamExample(URI) as pe: AttributeError: __enter__ That is the traceback that I receive in my terminal. If you need to see more of my code, please let me know.

AttributeError: 'str' object has no attribute 'append': Key and list value dictionary Hot Network Questions Adding coordinates to features inside processAlgorithm with PyQGIS