Question

/projects/mymath$ ls
__init__.py  __init__.pyc  mymath.py  mymath.pyc  tests

and under the directory tests I have

/projects/mymath/tests/features$ ls
steps.py  steps.pyc  zero.feature

I tried to import my factorial function

sys.path.insert(0,"../../")
#import mymath
from mymath.MyMath import factorial

But it said No module named MyMath.

Here is my dummy MyMath class.

class MyMath(object):

        def factorial(self, number):
                if n <= 1:
                        return 1
                else:
                        return n * factorial(n-1)

So what’s wrong? Thanks. Is this even a good practice (editing the sys path?)

This will work import mymath

Answer 1

From what I can tell, it’s right. There is no module named mymath.MyMath. There’s a module named mymath.mymath though…

To be explicit, when you create a folder and put an __init__.py file in it, you’ve crated a package. If your __init__.py file is empty, then you still have to explicitly import the modules in the package. So you have to do import mymath.mymath to import the mymath module into your namespace. Then you can access the things you want via mymath.mymath.MyMath, and so on. If you want to import the class directly in, you have to do this:

from mymath.mymath import MyMath

And as someone else has already explained, you can’t import a method from a class. You have to import the whole class.