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This article mainly introduces "how to use the ecological tools of python". In the daily operation, I believe that many people have doubts about how to use the ecological tools of python. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use the ecological tools of python". Next, please follow the editor to study!

1. Start a download server in 1 second:

Python2:python-m SimpleHTTPServer

Python3:python-m http.server

Visit: http://192.168.191.100:8000/

2. Convert string to json

[root@localhost ~] # echo'{"job": "developer", "name": "Imx", "sex": "male"}'| python-m json.tool

{

"job": "developer"

"name": "Imx"

"sex": "male"

}

[root@localhost ~] # echo'{"address": {"province": "zhejiang", "city": "hangzhou"}, "name": "Imx", "sex": "male"}'| python-m json.tool

{

"address": {

"city": "hangzhou"

"province": "zhejiang"

}

"name": "Imx"

"sex": "male"

}

3. Check whether the third-party library is installed correctly

1) Interactive

[root@localhost ~] # python

Python 2.6.6 (r266 84292, Aug 18 2016, 15:13:37)

[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

> import paramiko

2)-c parameter

[root@localhost ~] # python-c "import paramiko"

4. Pip usage

Pip is a substitute for easy_install.

Pip is in the epel feed, so you need to download the epel feed.

Yum-y install epel-release

Yum install python-pip

Pip install-U pip upgrade pip version

1), search for installation packages

Pip search flask

2) install a specific version of the installation package

Pip install flask==0.8

3), delete the installation package

Pip uninstall Werkzeug

4), view the information of the installation package

Pip show flask

5) check whether the dependencies of the installation package are complete (the latest subcommands provided by pip 9.0.1)

Pip check flask

6), view the list of installed packages

Pip list

7) Export the list of installed packages on the system to the requirements file

Pip freeze > requirements.txt

8) install from requirements file

Pip install-r requirements.txt

9) use the pip command to complete

Pip completion-- bash > > ~ / .profile

Soure / .profile

After completion with the command, pip install will be automatically entered by typing pip I

5. Techniques for accelerating pip installation

1) installation of source acceleration software using Douban or Aliyun

Pip install-I https://pypi.douban.com/simple/ flask

It is troublesome to specify the image source address every time, which can be solved as follows:

Vim / .pip/pip.conf

[global]

Index-url = https://pypi.douban.com/simple/

2) download the software to the local deployment

# download to local

Pip install-- download='pwd'-r requirements.txt

Or

Pip install-download='pwd' flask

After ls, you can see that after downloading to the current directory, pip will automatically deal with the dependency problem, that is, download the dependency package as well.

# Local installation

Pip install-- no-index-f file://'pwd'-r requirements.txt

Or

Pip install-download='pwd' flask

6. Code completion plug-in

Finally found a plug-in, for Vim code block automatic completion support is very good. Recommend snipMate to everyone. SnipMate can help you implement Textmate-like functionality on vim, automatic code blocks are very powerful, and code blocks are customizable. We only need to edit the * .snippets file in the ~ / .vim / snippets/ directory to automatically generate the code according to our own requirements.

Use

Download snipMate and extract it to your Vim directory: ~ / .vim/

Download address: http://www.vim.org/scripts/script.php?script_id=2540

Create a test file:

[root@t-mysql01 .vim] # vim a.py

#! / bin/python

After entering for, press the tab key to complete the code automatically.

7. Edit prompt plug-in jedi-vim

Unlike snipmate, the plug-in is smarter, and jedi-vim is more affectionately known as programming hints rather than code completion plug-ins.

Installation method:

Environment:

Python 2.6 +

Vim > = 7.3

Install an administrative tool for the python plug-in, vim-pathogen or vundle, where pathogen is installed

Mkdir-p ~ / .vim/autoload ~ / .vim/bundle & &\

Curl-LSso ~ / .vim/autoload/pathogen.vim https://tpo.pe/pathogen.vim

Edit ~ / .vimrc file, add

Execute pathogen#infect ()

It is important to note here that if the vimrc file contains

Syntax on

Filetype plugin indent on

And so on, then put the above statement before these, such as the following:

Execute pathogen#infect ()

Syntax on

Filetype plugin indent on

Install jedi

Pip install jedi

Get jedi-vim

Cd ~ / .vim/bundle/ & & git clone-- recursive https://github.com/davidhalter/jedi-vim.git

8. Syntax checking and highlighting plug-ins

Syntastic is a plug-in used by Vim to verify syntax, validating files and presenting errors to users through an external syntax validator. This process can be done when needed, or automatically when the file is saved. "that's what the plug-in's official documentation says." If a syntax error is detected, it will prompt the user, because you can know the syntax error without compiling the code or executing the script, and the user will enjoy it. "

The installation process is similar to the method mentioned in the first part, you only need to run the following command:

Cd / .vim/bundle/

Git clone https://github.com/scrooloose/syntastic.git

Once you have successfully installed the plug-in (that is, the above command was successfully executed), you do not need to make any configuration-the plug-in is automatically loaded when Vim starts.

Now, open a source file and save it with the: W Vim command to use the plug-in. After waiting for a while, if there is a good syntax error in the source code, it will be highlighted.

9. Vim sets python automatic indentation

Set the automatic indentation of python in Vim:

A), edit vimrc file: enter command

Vim/ etc/vim/vimrc/

B), paste the following code and save it (basically, if seems to be a problem with the test)

Set filetype=python

Au BufNewFile,BufRead * .py,*.pyw setf python

Set autoindent "same level indent

Set smartindent "next level indent

Set expandtab

Set tabstop=4

Set shiftwidth=4

Set softtabstop=4

10. Use ipython for interactive programming

1), better editor

Yum install ipython

# ipython

In [10]: line = "Mysql slave binlog position: master host '10.173.33.35, filename' mysql-binlog0002',position '43242343243"

In [11]: line.split ("'")

Out [11]:

['Mysql slave binlog position: master host'

'10.173.33.35'

"filename"

'mysql-binlog0002'

"position"

'43242343243'

']

In [12]: host = line.split ("'") [1]

In [13]: print host

10.173.33.35

In [18]: filename = line.split ("'") [3]

In [19]: print filename

Mysql-binlog0002

In [21]: position = line.split ("'") [5]

In [22]: print position

43242343243

In [25]: print (host,filename,position)

('10.173.33.35,' mysql-binlog0002', '43242343243')

In [27]: position = int (position)

In [28]: type (position)

Out [28]: int

In [29]: print (host,filename,position)

('10.173.33.35,' mysql-binlog0002', 43242343243)

2) better access to help information

In [30]: import os

In [32]:? os.path.is*

Os.path.isabs

Os.path.isdir

Os.path.isfile

Os.path.islink

Os.path.ismount

In [33]: os.path.isfile?

Type: function

String Form:

File: / usr/lib64/python2.6/genericpath.py

Definition: os.path.isfile (path)

Docstring: Test whether a path is a regular file

In [35]: import json

In [36]: json.dump?

In [36]: json.dump?? / / use two question marks to get more comprehensive help information, and even include the source code for the implementation of the function

In [39]: d = dict

In [40]: json.dump?

In [42]: json.dumps (d) / / convert dictionary to json string

Out [42]:'{"a": 1, "c": 3, "b": 2}'

In addition to using the question mark to get the help information of the object, ipython also provides another way to get the object information, such as the definition, document and file of the object.

In [43]: import json

In [44]:% pdef json

Object is not callable.

In [45]:% pdef json.dump

Json.dump (obj, fp, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, encoding='utf-8', default=None, * * kw)

In [47]:% pfile json.dump

In [47]:% pdoc json.dump

In [49]:% pinfo json.dump

3), magic function

All functions provided by ipython start with%, and these functions become magic functions.

In [50]:% lsmagic or% to get all magic functions.

In [51]:% save? / / View help for the magic function

4), interact with the operating system

You can use% ls% pwd, etc., to execute commands under linux, or! ls! cd to execute commands under linux.

You can also capture the command test output by assignment:

In [7]: data =! df-h

In [9]: data

Out [9]:

['Filesystem Size Used Avail Use% Mounted on'

'/ dev/sda3 96G 3.9G 88G 5% /'

'tmpfs 1000M 68K 1000M 1% / dev/shm'

'/ dev/sda1 477m 41m 411m 9% / boot']

11. The use of jupyter notebook

[root@localhost ~] # pip install jupyter

If you report Python.h: No such file or directory, you can solve it by yum install python-devel.

At this point, the study on "how to use the ecological tools of python" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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