Trac #20218: Use pip to install Python dependencies

New tarball: https://pypi.python.org/packages/26/34/0f3a5efac31f27fabce6
4645f8c609de9d925fe2915304d1a40f544cff0e/appnope-0.1.0.tar.gz

---------

Work has already been done--for example in #19187--on using `pip` for
`sage -i` where appropriate.  However, a normal build of sage does not
use `pip` for installing any Python spkgs; rather, they run `python
setup.py install` which until recently has always been *the* way to
install Python packages.

I can suggest several reasons why `pip` should be used instead of this
method.  To be clear--as many people think of `pip` as a tool for
installing packages from the internet--this is not strictly the case.
`pip` can be used to install an already downloaded tarball, or even
straight from a source tree unpacked from a tarball or checked out from
VCS.  The typical way to do this is to change directories to the
directory containing the `setup.py` script and running `pip install .`.
This still ultimately calls `setup.py install`, among other `setup.py`
commands, but with the right incantations to perform a pip-style flat
install.  Now, why is this preferable?

1. Future-compatibility.  One of the goals that the Python packaging
community has been working toward over the past several years has been
to decouple Python package installation from build system.
Traditionally `setup.py` provided both a build program and an
installation program.  At best it will still stick around as a build
program, but its use for installation is being discouraged.  There is
now finally a PEP (http://legacy.python.org/dev/peps/pep-0516/), still
very much in draft state, specifically concerning this decoupling.
Under this new regime `pip` will not likely be the *only* software for
installing Python packages, but the assumption can no longer be that
there is a `setup.py` script at all.

2. `pip` avoids using `easy_install`.  `easy_install` is an older
installation program for Python packages that was bundled with
setuptools--when a Python project uses setuptools in its `setup.py`, the
`setup.py install` command invokes `easy_install` *by default*.  The
behavior of `easy_install` is to install the package as an egg
archive/directory.  `easy_install` has several disadvantages, of which
this is just one, but there are a couple reasons that this alone is a
problem:[[br]][[br]]
  a. Every .egg requires a `sys.path` entry, hence difficult to debug
paths that look like this:
{{{
#!python
>>> pprint(sys.path)
['',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/setuptools-18.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Cython-0.23.3-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/MarkupSafe-0.23-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Jinja2-2.7.3-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/six-1.10.0-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Pygments-2.0.2-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Sphinx-1.2.2-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/zope.interface-4.1.3-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Twisted-15.5.0-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-packages
/pytz-2013b0-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Babel-2.1.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Werkzeug-0.11.2-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/speaklater-1.3-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/python_openid-2.2.5-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/itsdangerous-0.24-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Flask-0.10.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Flask_Silk-0.2-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Flask_AutoIndex-0.5-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Flask_Babel-0.9-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Flask_OpenID-1.2.5-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/Flask_OldSessions-0.10-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/webassets-0.11.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/sagenb-0.11.6.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/backports.ssl_match_hostname-3.4.0.2-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/certifi-14.5.14-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/tornado-4.1-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/setuptools_scm-1.7.0-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/path.py-7.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/pickleshare-0.5-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/simplegeneric-0.8.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/decorator-4.0.6-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/networkx-1.10-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/python_dateutil-2.2-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/cycler-0.9.0-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/matplotlib-1.5.0-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/jsonschema-2.4.0-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/mistune-0.5.1-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/pip-6.1.1-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/pkgconfig-1.1.0-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/singledispatch-3.4.0.3-py2.7.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-
packages/rpy2-2.7.5-py2.7-linux-x86_64.egg',
 '/home/iguananaut/src/sagemath/sage/local/lib/python',
 '/home/iguananaut/src/sagemath/sage/local/lib/python/site_packages',
 '/home/iguananaut/src/sagemath/sage/local/lib/python27.zip',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/plat-linux2',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/lib-tk',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/lib-old',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/lib-dynload',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-packages']
}}}
     With the flat install style used by `pip`, and now more generally
favored, the `sys.path`, with no eggs, would be simply:
{{{
#!python
>>> pprint(sys.path)
['',
 '/home/iguananaut/src/sagemath/sage/local/lib/python',
 '/home/iguananaut/src/sagemath/sage/local/lib/python27.zip',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/plat-linux2',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/lib-tk',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/lib-old',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/lib-dynload',
 '/home/iguananaut/src/sagemath/sage/local/lib/python2.7/site-packages']
}}}
     which is certainly easier to read and reason about.[[br]][[br]]
  b. The egg import mechanism requires writing to a common file during
egg installation--easy-install.pth.  This causes problems in parallel
installations, requiring patches to setuptools.  The flat install style
used by pip has no such problems--there is a no single common file
written to by pip during installation of packages (other than maybe the
log file, which is only for debugging purposes).

As I explained in [http://trac.sagemath.org/timeline?from=2016-02-25T10%
3A23%3A37-08%3A00&precision=second this comment], when a Python package
is installed with `pip`, `pip` actually slips setuptools into the
installation process, whether the package uses it explicitly or not.
There are reasons for this not worth going into now.  This is no problem
for the vast majority of cases.  The only exception I know of is that
setuptools doesn't handle the `data_files` option well when `--prefix`
is changed.  As far as I can tell this is only a problem for sage itself
and possibly for sagetex, but these don't even use `setuptools` in the
first place, so until we have a workaround for that it does no harm if
we keep using `setup.py install` for those packages, if nothing else
works.

Most of the rest of the Python packages included by default in a Sage
build (I haven't checked all of -optional yet) already use setuptools.
I checked the setup.py of all the rest that don't explicitly use
setuptools--these include `docutils`, `mpmath`, `pexpect`, `ptyprocess`,
`Pycrypto`, `pyparsing`, `pyzmq`, `scipy`, and all packages from the
Jupyter team (`ip*`, `jupyter*`, `np*`, `notebook`, `traitlets`).

Most of these packages are known by me (from personal experience) to
work fine with pip.  Looking at the setup.py scripts of the rest of
them, most of them are fairly trivial and should work fine.

TL;DR, with the exceptions of sage and sagetex (pending work like
#20108), as well as pip itself the `spkg-install` scripts for Python
packages should change `setup.py install` commands to `pip install .`.
Their dependencies would also have to be updated to require pip to be
installed first.

At the same time the "uninstall" commands in those scripts can be
changed to use `pip uninstall`.

URL: https://trac.sagemath.org/20218
Reported by: embray
Ticket author(s): Erik Bray, Jeroen Demeyer
Reviewer(s): Jeroen Demeyer, Volker Braun

build/pkgs/alabaster/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/appnope/SPKG.txt

@@ -0,0 +1,5 @@
+= appnope =
+
+== Description ==
+
+Disable App Nap on OS X 10.9

build/pkgs/appnope/checksums.ini

@@ -0,0 +1,4 @@
+tarball=appnope-VERSION.tar.gz
+sha1=838158bf881f3e8538b7bfeff4ad289a6623cdda
+md5=932fbaa73792c9b06754755a774dcac5
+cksum=4167491137

build/pkgs/appnope/dependencies

@@ -0,0 +1,5 @@
+$(PYTHON) | pip
+
+----------
+All lines of this file are ignored except the first.
+It is copied by SAGE_ROOT/build/make/install into SAGE_ROOT/build/make/Makefile.

build/pkgs/appnope/package-version.txt

@@ -0,0 +1 @@
+0.1.0

build/pkgs/appnope/spkg-install

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+cd src
+
+# Only install this package on OS X
+if python -c 'from sys import *; exit(0 if platform == "darwin" else 1)'; then
+    $PIP_INSTALL . || exit $?
+else
+    echo "Not OS X, skipping installation of package 'appnope'"
+fi

build/pkgs/appnope/type

@@ -0,0 +1 @@
+standard

build/pkgs/babel/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/backports_abc/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/backports_abc/spkg-install

@@ -8,7 +8,8 @@ fi
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
+
 if [ $? -ne 0 ]; then
     echo "Error installing backports_abc ... exiting"
     exit 1

build/pkgs/backports_shutil_get_terminal_size/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) | setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/backports_shutil_get_terminal_size/spkg-install

@@ -11,4 +11,4 @@ for patch in ../patches/*.patch; do
     fi
 done
 
-python setup.py install
+$PIP_INSTALL .

build/pkgs/backports_ssl_match_hostname/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/backports_ssl_match_hostname/spkg-install

@@ -8,7 +8,8 @@ fi
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
+
 if [ $? -ne 0 ]; then
     echo "Error installing backports.ssl_match_hostname ... exiting"
     exit 1

build/pkgs/certifi/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/certifi/spkg-install

@@ -8,7 +8,8 @@ fi
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
+
 if [ $? -ne 0 ]; then
     echo "Error installing certifi ... exiting"
     exit 1

build/pkgs/cvxopt/dependencies

@@ -1,4 +1,4 @@
-numpy $(BLAS) cephes gsl glpk | pkgconfig matplotlib
+numpy $(BLAS) cephes gsl glpk | pkgconfig pip matplotlib
 
 matplotlib is needed to test cvxopt (i.e., if SAGE_CHECK=yes). See #12742.
 

build/pkgs/cvxopt/spkg-install

@@ -37,14 +37,8 @@ if [ "$UNAME" = FreeBSD ]; then
     export CPPFLAGS="$CPPFLAGS -I$SAGE_LOCAL/include"
 fi
 
-# Delete old version
-site_packages="$SAGE_LOCAL/lib/python/site-packages"
-rm -rf "$site_packages"/cvxopt "$site_packages"/cvxopt-*.egg*
+$PIP_INSTALL .
 
-# Note: Avoid shared libraries inside egg files, Trac #19467
-python setup.py install \
-       --single-version-externally-managed \
-       --record /dev/null
 if [ $? -ne 0 ]; then
     echo "Error building/installing cvxopt"
     exit 1

build/pkgs/cycler/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) setuptools six
+$(PYTHON) six | setuptools pip
 ----------
 All lines of this file are ignored except the first.
 It is copied by SAGE_ROOT/build/make/install into SAGE_ROOT/build/make/Makefile.

build/pkgs/cycler/spkg-install

@@ -8,7 +8,7 @@ fi
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
 if [ $? -ne 0 ]; then
     echo "Error installing cycler ... exiting"
     exit 1

build/pkgs/cython/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/cython/spkg-install

@@ -19,10 +19,7 @@ for patch in ../patches/*.patch; do
     fi
 done
 
-# Remove old copies of Cython
-rm -rf "$SAGE_LOCAL"/lib/python*/site-packages/Cython*
-
-python setup.py install
+$PIP_INSTALL .
 
 if [ $? -ne 0 ]; then
     echo "Error installing Cython"

build/pkgs/dateutil/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) six setuptools
+$(PYTHON) six | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/dateutil/spkg-install

@@ -8,7 +8,7 @@ fi
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
 if [ $? -ne 0 ]; then
     echo "Error installing dateutil ... exiting"
     exit 1

build/pkgs/decorator/dependencies

@@ -1,4 +1,4 @@
-setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/decorator/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/docutils/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON)
+$(PYTHON) | pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/docutils/spkg-install

@@ -6,13 +6,11 @@ if [ "$SAGE_LOCAL" = "" ]; then
    exit 1
 fi
 
-#Remove the old version
-rm -rf "$SAGE_LOCAL"/lib/python/site-packages/docutils*
-
 #Install new version
 cd src
 
-python setup.py install
+$PIP_INSTALL .
+
 if [ $? -ne 0 ]; then
    echo "Error installing docutils."
    exit 1

build/pkgs/dot2tex/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON)
+$(PYTHON) | pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/dot2tex/spkg-install

@@ -6,10 +6,6 @@ if [ -z "$SAGE_LOCAL" ]; then
     exit 1
 fi
 
-# Delete any old version or setup.py refuses to overwrite it
-rm -rf "$SAGE_LOCAL/lib/python/site-packages/dot2tex"
-
-ls -al
 cd src
 
 for patch in ../patches/*.patch; do
@@ -21,13 +17,8 @@ for patch in ../patches/*.patch; do
     fi
 done
 
-python setup.py build
-if [ $? -ne 0 ]; then
-    echo >&2 "Error building dot2tex."
-    exit 1
-fi
+$PIP_INSTALL .
 
-python setup.py install
 if [ $? -ne 0 ]; then
     echo >&2 "Error installing dot2tex."
     exit 1

build/pkgs/flask/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/flask_autoindex/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/flask_babel/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/flask_oldsessions/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/flask_openid/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/flask_silk/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/functools32/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/functools32/spkg-install

@@ -13,7 +13,8 @@ fi
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
+
 if [ $? -ne 0 ]; then
     echo "Error installing functools32 ... exiting"
     exit 1

build/pkgs/future/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) setuptools
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/future/spkg-install

@@ -2,7 +2,7 @@
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
 if [ $? -ne 0 ]; then
     echo "Error installing future ... exiting"
     exit 1

build/pkgs/giacpy/dependencies

@@ -1,4 +1,4 @@
-cython giac cysignals | sympy maxima
+$(PYTHON) cython giac cysignals | pip sympy maxima
 
 The doctest suite (SAGE_CHECK=yes)  also uses Sympy and Maxima
 ----------

build/pkgs/giacpy/spkg-install

@@ -13,14 +13,7 @@ fi
 
 cd src
 
-
-# It is very important that we have SAGE_LOCAL set, otherwise this
-# might potentially delete stuff in /lib
-echo "Deleting $SAGE_LOCAL/lib/python/site-packages/giacpy*"
-rm -rf "$SAGE_LOCAL"/lib/python/site-packages/giacpy*
-
-
-sage setup.py install
+$PIP_INSTALL .
 
 if [ $? -ne 0 ]; then
     exit 1

build/pkgs/git_trac/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON)
+$(PYTHON) | setuptools pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/git_trac/spkg-install

@@ -8,7 +8,8 @@ fi
 
 cd src
 
-python setup.py install
+$PIP_INSTALL .
+
 if [ $? -ne 0 ]; then
     echo >&2 "Error installing git-trac, exiting."
     exit 1

build/pkgs/imagesize/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/ipykernel/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON)
+$(PYTHON) | pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/ipykernel/spkg-install

@@ -11,4 +11,4 @@ for patch in ../patches/*.patch; do
     fi
 done
 
-python setup.py install
+$PIP_INSTALL .

build/pkgs/ipython/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) jinja2 tornado pyzmq pickleshare simplegeneric traitlets | backports_shutil_get_terminal_size wcwidth prompt_toolkit
+$(PYTHON) jinja2 tornado pyzmq pickleshare simplegeneric traitlets | pip backports_shutil_get_terminal_size wcwidth prompt_toolkit pygments pexpect appnope
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/ipython/spkg-install

@@ -21,20 +21,8 @@ for patch in ../patches/*.patch; do
     fi
 done
 
-python setup.py build
-if [ $? -ne 0 ]; then
-    echo >&2 "Error building IPython."
-    exit 1
-fi
-
-echo "Removing old version of IPython..."
-rm -rf "$SAGE_LOCAL/lib/python/site-packages/IPython"
-if [ $? -ne 0 ]; then
-    echo >&2 "Error deleting previous version"
-    exit 1
-fi
+$PIP_INSTALL .
 
-python setup.py install
 if [ $? -ne 0 ]; then
     echo >&2 "Error installing IPython"
     exit 1

build/pkgs/ipython_genutils/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON)
+$(PYTHON) | pip
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/ipython_genutils/spkg-install

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-cd src && python setup.py install
+cd src && $PIP_INSTALL .

build/pkgs/ipywidgets/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) widgetsnbextension
+$(PYTHON) widgetsnbextension | pip
 
 ----------
 All lines of this file are ignored except the first.