Example of implementing asynchronous non-blocking access to the database using Python Tornado framework, pythontornado
Tornado is an http non-blocking server. We will use the tornado framework, mongodb database, and motor (asynchronous driver of mongodb) to implement tornado's non-blocking function.
Download and installation supported by other environments
1. Install mongodb
$ sudo apt-get install update$ s
! # Finally, the company manager also received e-mail from the salesman. Open, and only see a bunch of strange characters! # no problem, the company manager uses his private key to decrypt the ciphertext received, and can get the plaintext message = Rsa.decrypt (Crypto_email_text, Privkey). Decode () # Then, you can see the important Opportunity information print ( Message) # =================================# Scenario Two: Identification problem # in order to open up the market, the company man
Example Analysis of base64 encryption and decryption methods in python
This document describes the base64 encryption and decryption methods in python. Share it with you for your reference. The specific analysis is as follows:
I. base64
Base64 is a representation of binary data based on 64 printable characters. Because the power of 6 in 2 is equal to 64, every 6 b
. No matter what event occurs, the publisher is triggered to notify the subscriber by calling the notification method. This notification will only notify registered buyers when an event occurs.
A simple python implementation:
Let's implement an example of how different users publish technical emails on TechForum. When any user publishes a new email, other users w
This example describes the Base64 encryption and decryption method in Python. Share to everyone for your reference. The specific analysis is as follows:
First, base64
Base64 is a representation that represents binary data based on 64 printable characters. Because 2 of the 6 times equals 64, each 6 bit is a unit, corresponding to a printable character. Three bytes have 24 bits, corresponding to 4 Base64 un
. Import and Export data:Python manage.py dumpdata appname > appname.jsonpython manage.py loaddata Appname.json8.Django Project Terminal:Python manage.py ShellIf you installed the Bpython or Ipython will automatically use their interface, recommend the use of Bpython9. Database command line : ( inline SQLite)Python manage.py Dbshell10. More Commands:python manage.py # you can see a detailed list that is especially useful when you forget your name. The
In Internet-based applications, programs often need to send e-mails automatically. For example, a website registration system will send an email to confirm the registration when the user registers, and when the user forgets the login password, the password is retrieved by mail. The Smtplib module is a client implementation of the SMTP (Simple Mail Transfer Protocol) in
substrings. The group (group) to be extracted is represented by (). Like what:
^ (\d{3})-(\d{3,8}) $ defines two groups, which can extract the area code and local numbers directly from the matching string:
>>> m = Re.match (R ' ^ (\d{3})-(\d{3,8}) $ ', ' 010-12345 ')
>>> m
If a group is defined in a regular expression, a substring can be extracted with the group () method on the match object.
Notice that group (0) is always the original string, group (1), Group (2) ... Represents the 1th, 2 、.
This article mainly introduces the form processing example in the Python Django framework. form processing is a basic operation in Django. if you need it, you can refer to the following example about books, authors, and publishing houses:
from django.db import modelsclass Publisher(models.Model): name = models.CharField(max_length=30) address = models.CharFie
be sent after verifying that the user information is legitimate.Smtp.sendmail (From_addr, To_addrs, msg[, Mail_options, Rcpt_options])Send the message. Notice here that the third parameter, MSG, is a string that represents the message. We know that the mail is generally composed of the title, sender, recipient, mail content, attachments, etc., when sending mail, pay attention to the format of MSG. This format is the format defined in the SMTP protocol. In the above
The following is an example of a simple python daemon process. Monitor whether the mailbox capacity is exceeded. If the mailbox capacity exceeds the upper limit, send an email.
The implementation is very simple, just to illustrate how to use python to write daemon. With this, you can handle other complicated daemon pro
='localhost',3port=10000,4authmechanism="PLAIN",5User='Root',6password='Test',7Database='default') as Conn:8 With conn.cursor () as cur:9 #Show DatabasesTen Printcur.getdatabases () One #Execute Query ACur.execute ("select * FROM table") - #Return column info from query - PrintCur.getschema () the - #Fetch Table Results - forIinchCur.fetch (): - PrintIThere is basically no ma
A simple use of re.search to match a keyword in a string[Email protected] ~]# vim ceshi.py#!/usr/bin/env python#coding:utf-8import reerr= ("stderr: ' Permission denied (PublicKey) fatal:could not read from remote Repository ") Matchpro = Re.search (R ' Permission denied \ (publickey\) ', err, re. M|re. I) Print Matchpro.group ()[email protected] ~]#
Suppose you now have such a SQL log:SELECT * from Open_app WHERE 1 and ' client_id ' = ' a08f5e32909cc9418f ' and ' is_valid ' = ' 1 ' ORDER BY id DESC limit 32700,10 0;# time:160616 10:05:10# [email protected]: SHUQIN[QQQQ] @ [1.1.1.1] id:46765069# schema:db_xxx last_ errno:0 killed:0# query_time:0.561383 lock_time:0.000048 rows_sent:100 rows_examined:191166 rows_affected:0# Bytes_sent:14653set timestamp=1466042710; SELECT * from Open_app WHE
The code and tools usedSample site source + Framework + book pdf+ Chapter codeLink: https://pan.baidu.com/s/1miHjIYk Password: af35Environmentpython2.7Win7x64Sample Site SetupWswp-places.zip in the book site source codeFrames used by the Web2py_src.zip site1 Decompression Web2py_src.zip2 then go to the Web2py/applications directory3 Extract the Wswp-places.zip to the applications directory4 return to the previous level directory, to the Web2py directory, double-click web2py.py, or execute comman
The examples in this paper describe Python is replacing the string function re.sub usage. Share to everyone for your reference, as follows:Python re.sub is a standard library of Python regular, with the main function being to match strings to be replaced with regular matchesand replace it with the string you want.The Re.sub function takes a regular expression-based substitution workHere is a sample source c
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