如何在Python IDLE中使用Numpy？

Question

Variations of this question have been asked, but the answers always start from scratch (ie from installing numpy).

I already have numpy installed on my computer from an earlier time when I downloaded Anaconda.

If I try to install numpy again using pip install numpy , I get a long error like, the end of which looks like

Command C:\Python27\python.exe -c "import setuptools, tokenize;__file__='c:\\users\\imray~1\\appdata\\local\\temp\\pip_build_Imray\\numpy\\setu
p.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record c:\users\imray~1\appd
ata\local\temp\pip-smduhf-record\install-record.txt --single-version-externally-managed --compile failed with error code 1 in c:\users\imray~1\appdat
a\local\temp\pip_build_Imray\numpy
Storing debug log for failure in C:\Users\Imray\pip\pip.log

numpy works fine when I open cmd from inside the Anaconda folder and command import numpy . But it won't work from IDLE even if I navigate to said folder (via os.chdir('C:\\Anaconda') ) and issue the same command.

How do I get numpy to work in IDLE?

Answer 1

Firstly, you might already know that Anaconda comes with its own free IDE, very similar to IDLE in many respects. It's known as Spyder, and should be accessible in any terminal as: spyder . You could stop reading at this point and use that.

But if you really want to use IDLE, you'll need to track it down first. It's bundled with each distribution of Python that you have installed on your system. For example, I have a version of IDLE installed at the following location:

/usr/local/Cellar/python3/3.3.2/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/idle.pyw

If I run the Python distribution that this copy of IDLE belongs to, I can't access NumPy, because I've never installed it in that distribution:

python3
...
>>> import numpy as np
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named 'numpy'

I do have NumPy installed in my Canopy version of Python though (Canopy is very similar to Anaconda).

python
...
>>> import numpy as np
>>>

The workaround I can do to get NumPy in the console is this:

python /usr/local/Cellar/python3/3.3.2/Frameworks/Python.framework/Versions/3.3/lib/python3.3/idlelib/idle.pyw

I'm executing the Canopy distribution of Python, which does have NumPy installed, and calling the other Python distribution's IDLE as you would any script. Then the IDLE console pops up and does allow me to import and use NumPy.

This is bit of a workaround and I have found it to be hit-and-miss. When I use Canopy's Python to open the IDLE belonging to yet another distribution of Python (Python 2.7 installed through Homebrew), I sometimes get the following error when using the print statement:

Unknown object id: 'console'

So just be aware that you could run into issues like that.