Cannot locate packages. Manual installation required.

[Enjia]

I want to pip the sklearn packages and this issue occured:

[~/Documents]$ pip install sklearn
Querying PyPI ...
Downloading package ...
Opening: https://pypi.python.org/packages/1e/7a/dbb3be0ce9bd5c8b7e3d87328e79063f8b263b2b1bfa4774cb1147bfcd3f/sklearn-0.0.tar.gz
Save as: /private/var/mobile/Containers/Data/Application/2FDF8EB1-7BD8-4F6B-BF13-835FD5626CA9/tmp//sklearn-0.0.tar.gz (1148 bytes)
1148 [100.00%]
Extracting archive file ...
Archive extracted.
Running setup file ...
PipError('cannot locate source folder/file: /private/var/mobile/Containers/Data/Application/2FDF8EB1-7BD8-4F6B-BF13-835FD5626CA9/tmp/c94a7735c38f47a3b7098ff3def7eaae/sklearn-0.0/wheel-platform-tag-is-broken-on-empty-wheels-see-issue-141.py',)
Failed to run setup.py
Fall back to directory guessing ...
Error: Cannot locate packages. Manual installation required.

Is there any solution to solve this problem？

[dgelessus]

sklearn is not the correct PyPI package name:

Use scikit-learn instead.

The correct package name is scikit-learn. However, scikit-learn requires SciPy, which is not available in Pythonista, so it's not possible to install scikit-learn in Pythonista.

[Enjia]

Thanks a lot!
BTW, is Pythonista suitable for machine learning? Because I'm studying this course~

[dgelessus]

That depends on what modules you need. A bunch of modules are preinstalled with Pythonista, but nothing machine-learning-related, I think. You can also install pure Python modules yourself (using Stash pip, or by manually copying the module files into site-packages), but you cannot install extension modules that use native code (C, C++, Assembly, Fortran, etc.). Apple has strict requirements about how native libraries have to be signed, which makes it impossible to use any native libraries in Pythonista, unless they came with iOS or the app itself.

[tchy]

and why？
[~/Documents]$ pip install pypng
Querying PyPI ...
Downloading package ...
Opening: https://pypi.python.org/packages/2f/b1/c8dfcf50feb12a30be7d95c5f45d638704682487d8e50419ef41463febcd/pypng-0.0.18.tar.gz
Save as: /private/var/mobile/Containers/Data/Application/266D588E-6FF6-4CD4-A25D-542961114B7E/tmp//pypng-0.0.18.tar.gz (377942 bytes)
377942 [100.00%]
Extracting archive file ...
Archive extracted.
Running setup file ...
IOError(2, 'No such file or directory')
Failed to run setup.py
Fall back to directory guessing ...
Error: Cannot locate packages. Manual installation required.