Which version of python should be installed?

The version of Python has been constantly updated. Here are two recommended versions: 2.7 for the Python2.X series; 3.5 for the Python3.X series

##windows ：Install 2.7 and 3.5 at the same time

1. Download the installation package

https://www.python.org/downloads/

2. Installation

Default installation path: C:\python27

3. Configure environment variables

[Right-click computer]--"[Properties]--"[Advanced system settings]--"[ Advanced】--》[Environment Variables]--》[Find the line with the variable name Path in the second content box, double-click] --> [The Python installation directory is appended to the variable value, separated by;]

For example: original value; C:\python27, remember to have a semicolon in front

linux: Change to 2.7 into 3.5

yum -y install python-devel openssl openssl-devel gcc sqlite sqlite-devel mysql-devel libxml2-devel libxslt-devel
wget https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xz
tar xf Python-3.5.2.tar.xz
./configure --prefix=/usr/local/python3.5 --with-threads --enable-shared
make && make altinstall
mv /usr/bin/pip /usr/bin/pip_old
mv /usr/bin/easy_install /usr/bin/easy_install_old
mv /usr/bin/python /usr/bin/python_old
ln -s /usr/local/python3.5/lib/libpython3.5m.so /usr/lib
ln -s /usr/local/python3.5/lib/libpython3.5m.so.1.0 /usr/lib
ln -s /usr/local/python3.5/lib/libpython3.5m.so /usr/lib64
ln -s /usr/local/python3.5/lib/libpython3.5m.so.1.0 /usr/lib64
ln -s /usr/local/python3.5/bin/python3.5 /usr/bin/python
ln -s /usr/local/python3.5/bin/easy_install-3.5 /usr/bin/easy_install
ln -s /usr/local/python3.5/bin/pip3.5 /usr/bin/pip
/sbin/ldconfig -v
python

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