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+====== Python3 ======
+If I want Python 3.7, I have to compile it myself.  Use "dnf" for RedHat based distros and "apt-get" for Debian.
+===== RedHat based distros =====
+<code bash>
+sudo dnf install readline-devel  # or up-arrow won't navigate history
+sudo dnf install sqlite-devel openssl-devel bzip2-devel
+sudo dnf install xz-devel
+</code>
+Then on Fedora and CentOS...
+<code bash>
+wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz
+tar -xvf Python-3.7.0.tgz
+cd Python-3.7.0/
+./configure --prefix=/usr/local/bin/python3.7 --enable-optimizations
+make
+sudo make install
+# sudo ln -s /usr/local/bin/python3.7/bin/python3 /usr/bin/python3
+</code>
+On my dev system at work, I seem to have configured a prefix like /opt/python3. Then when CentOS updates itself, it changes a symbolic link in /usr/bin/python3
+    sudo rm /usr/bin/python3 && sudo ln -s /opt/python3/bin/python3 /usr/bin/python3
+For **OS X**, brew upgrading httpie seems to upgrade to the latest Python 3, so I didn't have to do stuff.
+===== Debian based distros =====
+For Debian (eg., Rasbian) try [[http://www.unixmen.com/howto-install-python-3-x-in-ubuntu-debian-fedora-centos/|the following]] (on raspberry pi libssl-dev isn't available):
+<code bash>
+sudo apt-get install build-essential libncursesw5-dev libreadline-dev libssl-dev libgdbm-dev libc6-dev libsqlite3-dev tk-dev libffi-dev
+</code>
+<code>
+The necessary bits to build these optional modules were not found:
+_bz2                  _lzma                 _ssl
+</code>
+On Raspbian, I put it in the default location:
+<code bash>
+cd Python-3.7.0/
+./configure --enable-optimizations
+make -j4
+sudo make install
+</code>
+===== Modules =====
+Sometimes I have trouble with pip3 (ImportError: cannot import name 'main' from 'pip'), so prefer to use "python 3 -m pip" instead.
+<code bash>
+sudo -H python3 -m pip install --upgrade pip
+sudo -H python3 -m pip install requests
+sudo -H python3 -m pip install numpy
+sudo -H python3 -m pip install matplotlib
+python3 -m pip install --user --upgrade httpie
+</code>
+===== Weird hack for impyla =====
+Refers to https://stackoverflow.com/questions/43918993/python-buildpack-fatal-error-sasl-sasl-h-no-such-file-or-directory
+<code bash>
+sudo python3 -m pip install --no-deps impyla
+sudo python3 -m pip install --no-deps git+https://github.com/snowch/thrift_sasl
+# sudo python3 -m pip install thriftpy
+</code>