When Python imports but IPython does not

小咪咪 2022-06-01 03:41 95阅读 0赞

# 本文内容转载自[博客][Link 1] #

This happens when the sys.paths of Python and IPython are different. To check the paths, enter the code below in each shell.

In the Python shell:

>>> import sys, pprint
    >>> pprint.pprint(sys.path)
    ['',
     '/Library/Python/2.7/site-packages',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
     '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
     '/usr/local/lib/python2.7/site-packages']
    >>>

In the IPython shell:

In [1]: import sys
    In [2]: sys.path
    Out[2]:
    ['',
     '/usr/local/bin',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
     '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
     '/Library/Python/2.7/site-packages',
     '/Library/Python/2.7/site-packages/IPython/extensions',
     '/Users/username/.ipython']
    In [3]:

In most cases, there will be a missing path from IPython’s sys.path. In this case, that path is /usr/local/lib/python2.7/site-packages. Now let’s try adding this path to IPython’s sys.path.  
Temporary solution  
If a path exists in Python but is missing in IPython, you can temporarily add the corresponding path to IPython using sys.path.append. For example, if /usr/local/lib/python2.7/site-packages was missing from your IPython path, you can append it as below in the IPython shell:

In [1]: import sys
    In [2]: sys.path.append('/usr/local/lib/python2.7/site-packages')

Permanant solution  
Enter the following in the terminal. ipython profile create will create a new IPython profile, and ipython locate will tell you where your IPython profile is located. Of course, your IPython profile path will probably be different with the example below.

$ ipython profile create
     $ ipython locate
     /Users/username/.ipython

Move to the path of your IPython profile printed above, and open the file profile\_default/ipython\_config.py.

$ cd /Users/username/.ipython
     $ vi profile_default/ipython_config.py

Add the following to profile\_default/ipython\_config.py.

c.InteractiveShellApp.exec_lines = [
         'import sys; sys.path.append("/usr/local/lib/python2.7/site-packages")'
     ]

# 本文内容转载自[博客][Link 1] #

[Link 1]: https://www.lucypark.kr/blog/2013/02/10/when-python-imports-and-ipython-does-not/