如何在 CentOS 7 上专门为 Python3 安装 pip？

Question

CentOS 7 already has Python2.7.5 stock installed. I am doing an online course that requires Python3.x installed. So these are the following steps i took to install Python3.7.3.rc1 :

$cd /usr/src
$sudo wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3rc1.tgz
$sudo tar xzf Python-3.7.3rc1.tgz
$cd Python-3.7.3rc1
$sudo ./configure --enable-optimizations
$sudo make altinstall
$sudo rm /usr/src/Python-3.7.3rc1.tgz
$python3.7 --version
Python 3.7.3rc1

I followed these steps religiously from this link : https://tecadmin.net/install-python-3-7-on-centos/

During my course i was required to install pyperclip using pip. So i did :

$python3.7 -m pip install pyperclip
/usr/local/bin/python3.7: No module named pip

Please suggest a method to install pip for Python3.7.3rc1.

Answer 1

You should have taken the default available python3, that is the python3.6 package in centos7 that would have been easier to setup rather than compile an unsupported version. Suggest you install the supported python3 package in centos

Try doing yum install python36 from repository

sudo yum install -y https://repo.ius.io/ius-release-el7.rpm

Update yum package

 sudo yum update

Install python36 along with pip

sudo yum install -y python36u python36u-libs python36u-devel python36u-pip

Below steps are for python3.7 , suggest avoiding unsupported packages. Alternate Steps for pip setup for Centos You need to install pip for python3.7 series Step 1: First install the EPEL Repository

sudo yum install epel-release

Step 2: Installing pip

python37 -m pip

Step 3: Verify if pip was installed properly pip --version

If the command not found error shows up, try

python37 -m ensurepip

Answer 2

I also as you said "followed these steps religiously from this link: https://tecadmin.net/install-python-3-7-on-centos/ ."

It was not an option for me to install python3.6, as I explicitly needed 3.7. I was able to install using the following procedure:

# AFAIK, libffi-devel solved the "ModuleNotFoundError: No module named '_ctypes'" I had when I tried installing without it. 
yum install libffi-devel 

cd /usr/src
wget https://www.python.org/ftp/python/3.7.5/Python-3.7.5.tgz
tar xzf Python-3.7.5.tgz
cd Python-3.7.5
./configure --enable-optimizations
make install  # Or: make altinstall
python3 -V
pip3 --version
rm -f /usr/src/Python-3.7.5.tgz

What I changed from the referenced article is the version (3.7.5 instead of 3.7.4) and in addition installed "libffi-devel". It could be that this one would have solved on 3.7.4 as well.

Answer 3

For CentOS 6 and 7 you can run this:

sudo yum install python37-setuptools sudo easy_install-3.7 pip

Edit: You should then be able to install using pip3 install <package>