python学习笔记1——安装python

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（1）安装python2.7.3　　
wget https://www.python.org/ftp/python/2.7.3/Python-2.7.3.tgz
　　
tar -zxvf Python-2.7.3.tgz
　　
cd Python-2.7.3
　　
./configure --prefix=/usr/local/python2.7 --with-openssl
　　
make
　　
make install
　　
mv /usr/bin/python /usr/bin/python2.6.6
　　
ln -s /usr/local/python2.7/bin/python /usr/bin/python
　　
sed -i '1s/^.*$/\#\!\/usr\/bin\/python2.6/' /usr/bin/yum
　　

　　
(2)安装ipython4.2.0
　　
wget https://pypi.python.org/packages/4e/c7/519b95112dba6f3ae91530bcb8564454c575fcb1fdb323b2b0ee9eff1227/ipython-4.2.0.tar.gz#md5=9c7c28eddbc39eb874d2c22025772d63
　　
tar -zxvf ipython-4.2.0.tar.gz
　　
cd ipython-4.2.0
　　
/usr/local/python2.7/bin/python setup.py install
　　

　　
必须进入ipython目录执行python（python2.7.3） setup.py install，安装之后的ipython才能使4.2.0,并且可以正常使用。
　　

　　
[root@localhost ~]# ipython
　　
/usr/local/python2.7/lib/python2.7/site-packages/IPython/frontend.py:21: ShimWarning: The top-level `frontend` package has been deprecated. All its subpackages have been moved to the top `IPython` level.
　　
  "All its subpackages have been moved to the top `IPython` level.", ShimWarning)
　　
WARNING: IPython History requires SQLite, your history will not be saved
　　
Python 2.7.3 (default, Mar  1 2016, 20:57:31)
　　
Type "copyright", "credits" or "license" for more information.
　　

　　
IPython 4.2.0 -- An enhanced Interactive Python.
　　
?         -> Introduction and overview of IPython's features.
　　
%quickref -> Quick reference.
　　
help      -> Python's own help system.
　　
object?   -> Details about 'object', use 'object??' for extra details.
　　

　　
In [1]:a=5
　　

　　
In [2]: a
　　
Out[2]: 5