Python notes: Python version upgrade __python

Minimize installation and replace Yum Source:
Http://mirrors.163.com/.help/CentOS7-Base-163.repo
Http://mirrors.163.com/.help/CentOS6-Base-163.repo

1. Download Repo file
Yum Install wget
wget Http://mirrors.163.com/.help/CentOS6-Base-163.repo

2. Back up and replace the system's repo files
cd/etc/yum.repos.d/
MV Centos-base.repo Centos-base.repo.bak
MV Centos6-base-163.repo Centos-base.repo

3. Perform Yum source update
Yum Clean All
Yum Makecache
Yum-y Update

4. Installation Development tools:
Yum groupinstall-y ' development tools '
5. Install the Python dependency pack:
Yum install-y zlib-devel bzip2-devel openssl-devel xz-libs

6. Download the new Python version:
Find a new version of the download link to the https://www.python.org/ftp/python/website
wget https://www.python.org/ftp/python/2.7.9/Python-2.7.9.tgz
CA python2.7.9
./configure--prefix=/usr/local
Make all && make Altinstall
Make clean

Make Distclean

Install Python-devel not required for compilation
7. Compile installation complete. Enter the following command to view the version
#/usr/local/bin/python2.7–v
Establish a soft connection to the bin directory of the current system default Python command (installed by default will add/usr/locl/bin to the PATH environment)
#ln-S/usr/local/bin/python2.7/usr/local/bin/python

#/usr/local/bin/python–v
At this point the query displays a version of: 2.7.9. But at this point Yum is not working properly, you need to modify the Yum configuration file.
#vi/usr/bin/yum
Change the #!/usr/bin/python of the head of the file to #!/usr/bin/python2.6///To save the old version before exiting.

8. Install Easy_install Extension
#wget https://pypi.python.org/packages/source/s/setuptools/setuptools-18.0.1.tar.gz
wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py
sudo/usr/local/bin/python2.7 ez_setup.py
sudo/usr/local/bin/easy_install-2.7 pip


9. Install a new version of Git (version is too low to report 401 errors):
GIT relies on the following packages:
$ yum Install curl-devel expat-devel gettext-devel openssl-devel zlib-devel perl-extutils-makemaker Package
$ wget Https://codeload.github.com/git/git/zip/master
$ CD Git-master
$ make prefix=/usr/local All
$ sudo make prefix=/usr/local install

9. When git error is installed: Usr/bin/perl makefile.pl prefix= '/usr/local/git ' install_base= '--localedir= '/usr/local/git/share/ Locale
Can ' t locate extutils/makemaker.pm in @INC (@INC contains:/usr/local/lib64/perl5/usr/local/share/perl5/usr/lib64/ Perl5/vendor_perl/usr/share/perl5/vendor_perl/usr/lib64/perl5/usr/share/perl5.) At makefile.pl Line 3.
BEGIN failed--compilation aborted at makefile.pl Line 3.
MAKE[1]: * * * [Perl.mak] Error 2
Make: * * * [Perl/perl.mak] Error 2

Yum Install Perl-extutils-makemaker Package

10. After you upgrade Python and install additional packages, you may receive the following error
Import Pycurl
ImportError:pycurl:libcurl Link-time SSL Backend (NSS) is different from Compile-time SSL backend (OpenSSL)
The solution is:
Pip Uninstall Pycurl
Export PYCURL_SSL_LIBRARY=NSS
Easy_install Pycurl
Note that the previous installation with Pip, and then uninstall, be sure to use Easy_install installation before you can import success


11. Reference;
https://github.com/h2oai/h2o-2/wiki/ Installing-python-2.7-on-centos-6.3.-follow-this-sequence-exactly-for-centos-machine-only