I recently installed Python 3 on my Mac OSX 10.6.8 and I haven't had any problems with modules or imports until now. I'm writing a function that tests whether or not a triangle is right angled based on the length of the sides and the guide that the exercise was in has a bunch of equalities to test so I can see if it works:
testEqual(is_rightangled(1.5,2.0,2.5), True)
testEqual(is_rightangled(4.0,8.0,16.0), False)
testEqual(is_rightangled(4.1,8.2,9.1678787077), True)
testEqual(is_rightangled(4.1,8.2,9.16787), True)
testEqual(is_rightangled(4.1,8.2,9.168), False)
testEqual(is_rightangled(0.5,0.4,0.64031), True)
I should apparently import a function called testEqual(a,b,c) from a module called test, since the example programme in the guide starts with from test import testEqual
, but when I typed that into my file I got this message:
from test import testEqual
ImportError: cannot import name testEqual
I suppose I should specify the path to the test module, but I can't find it my Python 3 library anywhere in my computer – just the 2.x ones that came installed with the computer, which are in /Library/Python
. import turtle
and import math
worked, so it must be somewhere.
For the most part, modules are just Python scripts that are stored in your Lib or Lib/site-packages folder, or local to the script being run. That's it.
You can manually go and check the PYTHONPATH variable contents to find the directories from where these built in modules are being imported. Running "python -v"from the command line tells you what is being imported and from where. This is useful if you want to know the location of built in modules.
By default, on Linux, Pip installs packages to /usr/local/lib/python2. 7/dist-packages. Using virtualenv or --user during install will change this default location. If you use pip show make sure you are using the right user or else pip may not see the packages you are referencing.
This is caused by the fact that the version of Python you're running your script with is not configured to search for modules where you've installed them. This happens when you use the wrong installation of pip to install packages.
The test
module in the Python stdlib doesn't contain a function called testEqual()
. Its documentation starts with
Note: The
test
package is meant for internal use by Python only. It is documented for the benefit of the core developers of Python. Any use of this package outside of Python’s standard library is discouraged as code mentioned here can change or be removed without notice between releases of Python.
Are you sure that this guide you're following doesn't have its own test.py
program that you're supposed to use instead?
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