Centos7 install Python2.7

1、 Delete existing Python
[ root@test ~]# rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps ##Forcibly delete installed programs and their associations
[ root@test ~]# whereis python |xargs rm -frv ##Delete all residual files##xargs, allows you to execute some other commands on the output
[ root@test ~]# whereis python ##Verify delete, return no result

2、 Delete existing yum
[ root@test ~]# rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps
[ root@test ~]# whereis yum |xargs rm -frv

3、 Create directories python and yum to store rpm packages

mkdir /software/python

mkdir /software/yum

4、 Use wget to download the rpm packages of python and yum respectively (note: it must correspond to the version number of the system)
(1) Download the rpm package of python:

cd /software/python to enter the directory

The download path is: http://vault.centos.org/7.1.1503/os/x86_64/Packages//
(Note that the centos version must be correct, my version is 7.1.1503)
The downloaded packages are:
wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/python-pycurl-7.19.0-17.el7.x86_64.rpm
wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/python-devel-2.7.5-16.el7.x86_64.rpm
wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/python-libs-2.7.5-16.el7.x86_64.rpm
wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/python-urlgrabber-3.10-6.el7.noarch.rpm
wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/rpm-python-4.11.1-25.el7.x86_64.rpm
(2) Download the rpm package of yum:

cd /software/yum

wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/yum-3.4.3-125.el7.centos.noarch.rpm
wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://vault.centos.org/7.1.1503/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-29.el7.noarch.rpm

5、 Install python and yum rpm package
(1) Install python:

cd /software/python

rpm -ivh python-* rpm-python-*

If there is a dependency problem of the installation package, you can solve it as follows:

rpm -ivh python-* rpm-python-* --nodeps --force

• • nodeps --force is for compulsory installation regardless of dependent packages.
    After installation, you can run python:

(2) Install yum:

cd /software/yum

rpm -ivh yum-*

So far, yum has been reinstalled successfully!

6、 Install pip
(1) First install the epel extension source:

yum -y install epel-release

(2) After the update is complete, you can install pip:

yum -y install python-pip

(3) Clear cache after installation:

yum clean all

(4) Upgrade pip:

python -m pip install --upgrade pip

7、 Install the required libraries
(1) Install NumPy, SciPy, Matplotlib, pandas Statsmodels

pip install numpy

pip install scipy

pip install matplotlib

pip install pandas

pip install statsmodels

(2) Upgrade NumPy, SciPy, Matplotlib, pandas Statsmodels

pip install --upgrade numpy scipy matplotlib pandas statsmodels

8、 Install scikit-learn

yum install python-tools

pip install --upgrade python-tools

pip install -U scikit-learn

9、 Verify that the installation was successful
$python

import numpy as np
import scipy
import pandas as pd
import sklearn
import matplotlib.pyplot as plt
If an error is reported:

Traceback (most recent call last):
File "", line 1, in
File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py", line 115, in
_ backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
File "/usr/lib64/python2.7/site-packages/matplotlib/backends/init.py", line 32, in pylab_setup
globals(),locals(),[backend_name],0)
File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 6, in
from six.moves import tkinter as Tk
File "/usr/lib/python2.7/site-packages/six.py", line 203, in load_module
mod = mod._resolve()
File "/usr/lib/python2.7/site-packages/six.py", line 115, in _resolve
return _import_module(self.mod)
File "/usr/lib/python2.7/site-packages/six.py", line 82, in _import_module
import(name)
ImportError: No module named Tkinter
Note that tkinter is not installed, use the following command to install:

$ sudo yum install tkinter
After testing, it will be fine

import statsmodels

10、 Install IPython
Install directly via command

pip install ipython