python, pip package management tool

Download Source Package python using douban

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Watercress source as the download source

Watercress Download: HTTP: //pypi.douban.com/simple
1, specify the use of watercress source as the download source when using pip download (here we download tornado)

pip install tornado -i http://pypi.douban.com/simple

Solution:

Clearly see the message there is no confidence in this douban download the source, then we give him a confidence motion

pip install tornado -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

We encountered when using the tool to download tornado pip a problem, pip is not installed - - now installed at pip

Prepared in advance a get-pip.py installation package (from the Internet to find myself go)

Also use our douban source to install it (have dependencies), a command to get

python get-pip.py -i http://pypi.douban.com --trusted-host pypi.douban.com 

3, now have learned to use domestic sources douban download python bag, but encountered a problem, would have to perform each time you download a big long string of commands so what - -

Of course, we have a solution, see below

first step:

Create a profile

/root/.pip/pip.conf

This configuration file directory does not even exist, you need to manually create, not to accidentally

Step two:

In the configuration file to write something, what it means to look up specific

[global]
index-url = http://pypi.douban.com/simple
[install]
trusted-host = pypi.douban.com

third step

You can normally use, for example,

python pip install, update, uninstall, demotion, and use pip Management Pack

Installation pip

Mounting official website (recommended)

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python get-pip.py

Linux apt installation

sudo apt-get install python-pip

Update pip

pip install --upgrade pip
#
pip install -U pip

Uninstall pip

sudo apt-get remove python-pip

pip version downgrade

python -m pip install pip==版本（如：9.0.3）

Use pip Management Pack

List installed packages

pip freeze 或 pip list

Freeze PIP
PIP Freeze can be used to derive its version of the package already installed and saved as a file, as follows:
PIP Freeze> filename (e.g. requirements.txt)
saved file (requirements.txt) may be directly used to install or uninstall, as follows:
install -r requirements.txt PIP
PIP Uninstall -r requirements.txt

Installation package

pip install 包名

To install a specific version of the package

pip install 包名==版本

Other editions range control symbols: ==,> =, <=,>, <
pip install the latest version of the package name #
pip install package name == # version specified version
pip install 'package name> version =' minimum version #

Upgrade package

pip install --upgrade 包名
#或
pip install -U 包名

Uninstall package

pip uninstall 包名

The use of domestic sources

sudo pip install -i https://pypi.tuna.tsinghua.edu.cn/simple 包名

View all methods in python modules

pydoc modules

>>> help("modules")

#python的sys模块也是可以用来查看模块信息的

import sys
sys.modules.keys()

Use the command line to view the pip

If you are using a pip as your python package manager, you can run the command line directly pip freezeor
pip list to view information about the installation package, of course, other package managers have similar functions, at the same time, you can also in introducing python interactive interpreter module to view the package information pip

import pip
installed_packages = pip.get_installed_distributions()
installed_packages_list = sorted(["%s==%s" % (i.key, i.version)
     for i in installed_packages])
print(installed_packages_list)

Use yolk to view

yolk, then if you have installed can use the yolk command to view packet information, you can use the $ pip install yolk yolk to install it simple to use, just the command line can operate under

$ yolk -l    #列出所有安装模块
$ yolk -a    #列出激活的模块
$ yolk -n    #列出非激活模块
$ yolk -U [packagename]  # 通过查询pypi来查看（该）模块是否有新版本

Pyodbc installation package

sudo apt-get install unixodbc-dev

Resolve Command "python setup.py egg_info" failed with error code 1 issue

pip install --upgrade setuptools
python -m pip install --upgrade pip

Pip command input error: from pip import main ImportError: can not import name 'main'

Error connection

qly@qlyComputer:~$ pip
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
ImportError: cannot import name 'main'

Mainly due to the ubuntu version due to upgrade pipd

Note: Because if / usr / bin / pip3 is a read-only file, without sudo, you may be prompted to insufficient permissions, if forced stored in read-only permission can result in damaged files, it is recommended when modifying the configuration files to see if we have permission to
modify It reads as follows:

原文：from pip import main 
修改后：from pip._internal import main

Then run pip still being given and continue to change the configuration file

Then pip change the configuration file with the same command

vi /usr/bin/pip

Modified as follows:

//修改前
from pip import main  
if __name__ == '__main__':  
    sys.exit(main()) 
修改后
from pip import __main__  //这行也要修改
if __name__ == '__main__':  
    sys.exit(__main__._main())//增加__main__._

Solution _blocking_errnos = {errno.EAGAIN, errno.EWOULDBLOCK} pip problem

 python2.6 get-pip.py 报错下面的错误
_blocking_errnos = {errno.EAGAIN, errno.EWOULDBLOCK} pip
解决方案：
# 1， 从官方github获取具体版本的pip
wget  https://raw.githubusercontent.com/pypa/get-pip/master/2.6/get-pip.py
# 2，运行刚才获取的pip文件
 python2.6 get-pip.py

Pip install the specified version, python2.6.6 not supported after pip10.

https://pypi.org Go to the download site desired version of pip

View the version history

Pip install with apt-get

sudo apt-get remove python-pip

But sometimes via apt-get install pip version too old, it will be reported reminded to upgrade pip pip when using an older version to install some packages. If you want to upgrade the latest pip, need to uninstall pip, command

sudo apt-get remove python-pip

Then install the source with the pip by the following method.

Source installation pip

Https://pypi.python.org/pypi/pip this site to download the corresponding version of the source, recommended as this compression format: pip-9.0.1.tar.gz, and then to the download directory, unzip the file and enter :

tar -xzvf pip-9.0.1.tar.gz
cd pip-9.0.1
sudo python setup.py install

pip installation fails (always Retry)

Always use pip install the following errors:

Mirroring too slow

pip install -i https://pypi.douban.com/simple django 

Unable to resolve domain name

vim /etc/resolv.conf

#添加如下几行，

nameserver 8.8.4.4
nameserver 8.8.8.8

use pip install python package Notes

The need to upgrade and then install pip

Related Commands

python -m pip install --upgrade pip
pip install --upgrade pip
pip install --upgrade wheel

pip3 install aiohttp

#例如安装图像包
pip install Pillow

#安装mysql
pip install mysql-connector-python-rf --allow-external mysql-connector-python

#安装sqlalchemy--ORM数据库

 pip install sqlalchemy

Solve 'python -m pip install --upgrade pip' error problem

When prompted to install the package

You are using pip version 9.0.3, however version 10.0.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

And I follow the requirements to run python -m after pip install --upgrade pip still not succeed, tips are as follows:

(venv) D:\Fish>python -m pip install --upgrade pip
Requirement already up-to-date: pip in d:\fish\venv\lib\site-packages (10.0.1)

So accordance with the requirements will be d:\fish\venv\lib\site-packages (10.0.1) 中的pip-10.0.1.dist-infodeleted, run again python -m pip install --upgrade pipafter the upgrade, before installing the package can not be installed!

window configuration pip domestic source

Folder window, enter:% APPDATA%
New pip folder
created pip.ini file
enter the following:

[global]

timeout = 6000

index-url = http://pypi.douban.com/simple

trusted-host = pypi.douban.com

Lack zlib module

Installation error

Compression requires the (missing) zlib module  

Installation failed due to lack of zlib module

yum install zlib zlib-devel -y
#重新执行
make && make install 
python ./setup.py install

Module missing mysql-devel

An error

EnvironmentError: mysql_config not found

Common solutions

yum install mysql-devel

Unresolved reference to the following description
rpm -qa | grep mysqlto find the corresponding package mysql version
download the corresponding version of mysql-devel, http: //rpm.pbone.net/

rpm -ivh ftp://mirror.switch.ch/pool/4/mirror/mysql/Downloads/MySQL-5.6/mysql-community-devel-5.xxxxx.x86_64.rpm

Installation again

pip install mysql-python

报错error: command 'gcc' failed with exit status 1

centos need to install python-devel, ubuntu need to install python-dev, but not solve the problem
currently using python2.7 version, yum install -y python2-devel
if using python3.6 version, yum install -y python3-devel
perhaps to use as a small version numberyum install -y python3.6-devel

Mirror domestic sources are:

V2EX: http: //pypi.v2ex.com/simple
watercress: http: //pypi.douban.com/simple
University of Science and Technology of China: http: //pypi.mirrors.ustc.edu.cn/simple/
Qinghua: https : //pypi.tuna.tsinghua.edu.cn/simple