CentOS 6.9 upgrade python2.7 problem

First, check the current version of the system Python

Python -V
pip -V

Second, install all the development tools package and dependent packages

yum groupinstall -y "Development tools”
yum install -y zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel

Third, download, compile and install Python

$ wget https://www.python.org/ftp/python/2.7.5/Python-2.7.5.tgz

$ tar zxf Python-2.7.5.tgz
$ cd Python-2.7.5
$ ./configure

$ make && make install

$ ll /usr/local/bin/py*
$ rm -f /usr/bin/python-config
$ ln -s /usr/local/bin/python /usr/bin/python
$ ln -s /usr/local/bin/python-config /usr/bin/python-config
$ ln -s /usr/local/include/python2.7/ /usr/include/python2.7
$ python -V 

Python 2.7.5 # output with the corresponding version number indicates the version number of your installed properly

Fourth, the installation and setup tools pip

pip is the python installation tools, a lot of common tools python, can be installed by a pip.
To install pip, you must first install setuptools. Official website, https://pypi.python.org/pypi/setuptools

Note that the downloadable version can not be too new (test version is available via the following)

Download setuptools (wget may not download, use the browser to download):

$ wget https://files.pythonhosted.org/packages/37/1b/b25507861991beeade31473868463dad0e58b1978c209de27384ae541b0b/setuptools-40.6.3.zip

$ unzip setuptools-40.6.3.zip
$ cd setuptools-40.6.3
$ python setup.py install

Setuptools properly after installation is complete, easy_install command will be installed in / usr / local / bin directory, you can use the command "which easy_install" to view.

After installation is complete, download pip. The following information in its website: https://pypi.python.org/pypi/pip

Download pip-19.1.1:

wget https://files.pythonhosted.org/packages/93/ab/f86b61bef7ab14909bd7ec3cd2178feb0a1c86d451bc9bccd5a1aedcde5f/pip-19.1.1.tar.gz --no-check-certificate

Similarly, the installation

tar vxf pip-9.0.1.tar.gz 
cd pip-9.0.1
python setup.py install

After the installation is complete, run pip

[root@hwthstest08 pip-8.1.1]# pip

Usage:   
  pip <command> [options]

Commands:
  install                     Install packages.
  download                    Download packages.
  uninstall                   Uninstall packages.
  freeze                      Output installed packages in requirements format.
  list                        List installed packages.
  show                        Show information about installed packages.
  search                      Search PyPI for packages.
  wheel                       Build wheels from your requirements.
  hash                        Compute hashes of package archives.
  completion                  A helper command used for command completion
  help                        Show help for commands.
  ....

A detector installation procedure:

[root@hwthstest08 pip-8.1.1]# pip install psutil

If you fail, the version number of the version number may be wrong, modify / usr / bin / pip in

#!/usr/bin/python
# EASY-INSTALL-ENTRY-SCRIPT: 'pip==9.0.1','console_scripts','pip'
__requires__ = 'pip==9.0.1'
import sys
from pkg_resources import load_entry_point

if __name__ == '__main__':
    sys.exit(
        load_entry_point('pip==9.0.1', 'console_scripts', 'pip')()
    )