ubuntu系统下安装pip3及第三⽅库的安装
ubuntu系统下会⾃带python2.x和python3.x坏境，不需要我们去安装。并且ubuntu系统下还会⾃动帮助我们安装python2.x坏境下的pip安装⼯具，
但是没有python3.x坏境下的pip3安装⼯具需要我们⼿动安装。
(1)安装pip3
⾸先输⼊命令$:python3-v
查看python3的具体版本，我这⾥是python3.6.
然后开始安装pip3，输⼊命令$:sudo apt-get install python3-pip
⾃⼰下载并进⾏安装，完成后，输⼊命令$:pip3-v查看pip3的版本
*这⾥要注意⼀定要更新pip3
输⼊命令$:pip install --upgrade pip
ubuntu怎么安装python
更新好pip3之后
(2)配置pip3
⼀定要以管理员的⾝份进⾏修改
⾸先要到pip的配置⽂件，命令为
$:cd usr
$:cd bin
在以管理员的⾝份打开，否则没有权限修改
输⼊命令$:sudo vi /usr/bin/pip
将pip中的配置⽂件修改为以下
from pip import __main__
if __name__=='__main__':
**如果上⾯的错了，就把⽂件先改回去，然后再按照这个⽅法修改，直⾄你输⼊pip会出现各种命令使⽤⽅法，说明就成功了。
若成功如下
zztsj@zztsj-Nitro-AN515-51:/usr/bin$ pip3
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.
check                      Verify installed packages have compatible dependencies.
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.
General Options:
-h, --help                  Show help.
--isolated                  Run pip in an isolated mode, ignoring environment variables and user configuration.
-v, --verbose              Give more output. Option is additive, and can be used up to 3 times.
-V, --version              Show version and exit.
-q, --quiet                Give less output. Option is additive, and can be used up to 3 times (corresponding to WARNING, ERROR,                              and CRITICAL logging levels).
--log <path>                Path to a verbose appending log.
--proxy <proxy>            Specify a proxy in the form [user:passwd@]proxy.server:port.
--retries <retries>        Maximum number of retries each connection should attempt (default 5 times).
--timeout <sec>            Set the socket timeout (default 15 seconds).
--exists-action <action>    Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup, (a)bort.
--trusted-host <hostname>  Mark this host as trusted, even though it does not have valid or any HTTPS.
--cert <path>              Path to alternate CA bundle.
-
-client-cert <path>        Path to SSL client certificate, a single file containing the private key and the certificate in PEM
format.
--cache-dir <dir>          Store the cache data in <dir>.
--no-cache-dir              Disable the cache.
--disable-pip-version-check
Don't periodically check PyPI to determine whether a new version of pip is available for download.
Implied with --no-index.
(3)安装第三⽅库
输⼊命令为$:pip3 install lxml
其中lxml为库的名字，可以根据你想安装的库进⾏修改

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