Add pip2, pip3 symlinks for images with python2

Fixes #123

(c) Copyright IBM Corp. 2016

all-spark-notebook/README.md

@@ -241,8 +241,17 @@ You can return to the default environment with this command:
 source deactivate
 ```
 
-The commands `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments.
+The commands `jupyter`, `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments. For convenience, you can install packages into either environment regardless of what environment is currently active using commands like the following:
 
+```
+# install a package into the python2 environment
+pip2 install some-package
+conda install -n python2 some-package
+
+# install a package into the default (python 3.x) environment
+pip3 install some-package
+conda install -n python3 some-package
+```
 
 ## JupyterHub
 

datascience-notebook/README.md

@@ -70,7 +70,17 @@ You can return to the default environment with this command:
 source deactivate
 ```
 
-The commands `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments.
+The commands `jupyter`, `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments. For convenience, you can install packages into either environment regardless of what environment is currently active using commands like the following:
+
+```
+# install a package into the python2 environment
+pip2 install some-package
+conda install -n python2 some-package
+
+# install a package into the default (python 3.x) environment
+pip3 install some-package
+conda install -n python3 some-package
+```
 
 
 ## JupyterHub

pyspark-notebook/Dockerfile

@@ -69,6 +69,9 @@ RUN conda create --quiet --yes -p $CONDA_DIR/envs/python2 python=2.7 \
     'scikit-learn=0.17*' \
     pyzmq \
     && conda clean -tipsy
+# Add shortcuts to distinguish pip for python2 and python3 envs
+RUN ln -s $CONDA_DIR/envs/python2/bin/pip $CONDA_DIR/bin/pip2 && \
+    ln -s $CONDA_DIR/bin/pip $CONDA_DIR/bin/pip3
 
 # Install Python 2 kernel spec into the Python 3 conda environment which
 # runs the notebook server

pyspark-notebook/README.md

@@ -143,8 +143,17 @@ You can return to the default environment with this command:
 source deactivate
 ```
 
-The commands `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments.
+The commands `jupyter`, `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments. For convenience, you can install packages into either environment regardless of what environment is currently active using commands like the following:
 
+```
+# install a package into the python2 environment
+pip2 install some-package
+conda install -n python2 some-package
+
+# install a package into the default (python 3.x) environment
+pip3 install some-package
+conda install -n python3 some-package
+```
 
 ## JupyterHub
 

scipy-notebook/Dockerfile

@@ -59,6 +59,9 @@ RUN conda create --quiet --yes -p $CONDA_DIR/envs/python2 python=2.7 \
     'h5py=2.5*' \
     'pyzmq' \
     && conda clean -tipsy
+# Add shortcuts to distinguish pip for python2 and python3 envs
+RUN ln -s $CONDA_DIR/envs/python2/bin/pip $CONDA_DIR/bin/pip2 && \
+    ln -s $CONDA_DIR/bin/pip $CONDA_DIR/bin/pip3
 
 USER root
 

scipy-notebook/README.md

@@ -67,8 +67,17 @@ You can return to the default environment with this command:
 source deactivate
 ```
 
-The commands `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments.
+The commands `jupyter`, `ipython`, `python`, `pip`, `easy_install`, and `conda` (among others) are available in both environments. For convenience, you can install packages into either environment regardless of what environment is currently active using commands like the following:
 
+```
+# install a package into the python2 environment
+pip2 install some-package
+conda install -n python2 some-package
+
+# install a package into the default (python 3.x) environment
+pip3 install some-package
+conda install -n python3 some-package
+```
 
 ## JupyterHub