python3 install pip3 (install pip3 for python 3.x)

This article mainly introduces install pip3 for python 3.x in detail, which has certain reference value. Interested friends can refer to it

Foreword:

The server I am currently using is centos6.x. The version of python that comes with the system is 2.6.x. However, whether it is learning or using python, python3 is currently the first choice. Then the problem arises. ---How to install the python3 environment, and how to install the corresponding pip3 for python3? More importantly, there are some built-in tools in our original system that require the python2.6 version, so the coexistence of python3 and python2, and the coexistence of pip2 and pip3 are required. The following article is my personal practice. (Install pip3 for python3)

The purpose of writing this article is to help comrades who also encounter the same problem (currently it is difficult to find information on the Internet, and most of it has not been practiced. The following is my experience, 100% Can succeed!! go!!go!!)

1. Install python3 first

Install python3.x I won’t go into details here, so easzy! !

1. First go to the official website to download the python3 installation package

Official website address ---I downloaded Python-3.5.2.tar.xz

2. Upload Package to server

3. Unzip

tar -xf Python-3.5.2.tar.xz

4. Compile and install

! ! ! ! Pay attention ⚠️ You need to install some necessary dependencies before compiling, otherwise you have to recompile when an error is reported---(I suffered this loss, so be careful...)

Install the necessary dependencies (at least the following two are required, I personally encountered the following two)

yum install openssl-devel -y
yum install zlib-devel -y

Okay, now you can compile with peace of mind. ：

cd Python-3.5.2
./configure --prefix=/opt/Python #安装目录可以自己定义无所谓。
make
make install

After the compilation is completed, a Python folder will be generated under /opt/. Yes, this is the compiled python - for convenience Friends can define a soft connection as follows:

# ln -s /opt/Python/bin/python3 /usr/bin/python3

In this way, you can directly consume python3 as follows:

Okay so far, our task of installing python3 under Linux has been completed. Let’s enter the key point and install pip3 for python3

2. Install pip for python3.x

In fact, this is not difficult. . Download several packages and execute two commands to get it done.

1. First install setuptools

Friends can download it through the official module library: Download address

Here I directly use wget to download the version 19.6 from the server. (Friends can try the new version...)

wget --no-check-certificate https://pypi.python.org/packages/source/s/setuptools/setuptools-19.6.tar.gz#md5=c607dd118eae682c44ed146367a17e26

tar -zxvf setuptools-19.6.tar.gz
cd setuptools-19.6.tar.gz
python3 setup.py build
python3 setup.py install

2. Then install pip directly and you're done. .

Similarly download it first and then execute the command to get it done! !

wget --no-check-certificate https://pypi.python.org/packages/source/p/pip/pip-8.0.2.tar.gz#md5=3a73c4188f8dbad6a1e6f6d44d117eeb

tar -zxvf pip-8.0.2.tar.gz
cd pip-8.0.2
python3 setup.py build
python3 setup.py install

After the installation is complete, let’s take a look at what is in the python bin directory

# #Ha ha. . Through the above we have installed pip3 for python3. . . (Friends can also make a soft connection for convenience and practicality...)

3. Let’s do a test

1. First, let’s enter python3

[root@centos3 bin]# python3
Python 3.5.2 (default, Jul 27 2016, 03:36:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymysql
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ImportError: No module named &#39;pymysql&#39; ##没有此模块奥
>>>

Okay, let’s try to install it with the newly installed pip3:

[root@centos3 bin]# /opt/Python/bin/pip3 install pymysql
Collecting pymysql
 Downloading PyMySQL-0.7.5-py2.py3-none-any.whl (77kB)
 100% |████████████████████████████████| 81kB 3.2kB/s 
Installing collected packages: pymysql
Successfully installed pymysql-0.7.5

######安装完成

The installation is complete. It seems that there is no problem with pip3 itself. Let’s test whether this module is actually installed on python3 (it may be installed on python2...-_-#)

[root@centos3 bin]# python3
Python 3.5.2 (default, Jul 27 2016, 03:36:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymysql
>>>

Hahaha ok. . Finish! !

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