Python

1. Python Connect PostgreHttps://wiki.postgresql.org/wiki/Using_psycopg2_with_PostgreSQL Using psycopg2 with PostgreSQLImportPSYCOPG2ImportPprint#get a connection, if a connect cannot is made an exception would be raised hereconn = Psycopg2.connect (

Python has the Configparser class, you can easily read data from the configuration file (such as the configuration of the DB, the configuration of the path), so you can write a function to implement the read config configuration.Config file is

Get Weather information#Encoding:utf-8Importurllib.requestImportRedefgethtml (URL): page=urllib.request.urlopen (URL) HTML=Page.read () page.close ( )returnHtml.decode ('UTF-8')defgetWeather (HTML): Reg='*'weatherlist=Re.compile (reg). FindAll (HTML)

The program is simple.Locate the site according to the URL to intercept the corresponding data.#!/usr/bin/env pythonimport urllib2import reprovice=raw_input (' input ' provice ') city=raw_input ("Input city:") url = "

The Django program requires a lot of API writing, and each function requires several adorners, such as@csrf_exempt @require_postdef foo (request): PassSince so many methods need to write 2 adorners, or more, what is the way to merge the multiple

Import reimport urllibimport osdef rename (name): name = name + '. jpg ' return name def gethtml (URL): page = Urllib.urlopen (URL) html = page.read () return htmldef getimg (HTML): reg = R ' src= ' (. +?\.jpg) "Pic_ext" Imgre

Maximum Path Sum Iproblem 18By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top t O Bottom is 23.37 42 4 68 5 9 3That is, 3 + 7 + 4 + 9 = 23.Find the maximum total from top to

Number Letter Countsproblem 17If the numbers 1 to 5 is written out in Words:one, both, three, four, five, then there is 3 + 3 + 5 + 4 + 4 = Letters Used in total.If all of the numbers from 1 to $ (one thousand) inclusive were written out in words,

These third-party packages, together with Python and Django, form a powerful ecosystem that greatly reduces effort and effort during development.These packages can basically meet most of our needs. The difference between people, one point is you

1Tuple definitions: Description: Tuples can not be modified, usually enclosed in parentheses. Example: #一般元组>>> 1 (2, 3) >>> (1, 2, 3)#一个元素的元组>>> (1,) (1,) >> > 2, (2,)#空元组 #元组的乘法2Tuple function Description: Converts a

To use Pychartdir 's drawings in Python, you need to install the Pychartdir module, which is installed in a different way than other Python modules. 1. Download pychartdir, download the corresponding ZIP package from the official website

This function returns the value of the next element of the iteration, primarily by calling the __next__ () method. If the default parameter is set and the next element does not exist, it returns the value of the default parameter, otherwise throws

[Translate Python 3.x official documentation] The Python Tutorial,Python is an easy to learn, powerful programming language. It has efficient high-level data structures and a simple but valid tive approach to object-oriented programming. Python's

Python standard library: built-in function len (s) This function returns the length of object s. The so-called length refers to the number of data items in the container class, such as strings, tuples, lists, and dictionaries. Example: # Len ()

Euler's plan (python) problem 9Special Pythagorean tripletProblem 9 A Pythagorean triplet is a set of three natural numbers,ABC, For which, A2 + B2 = C2 For example, 32 + 42 = 9 + 16 = 25 = 52. There exists exactly one Pythagorean triplet for

Euler's plan (python) problem 8Largest product in a seriesProblem 8 The four adjacent digits in the 1000-digit number that have the greatest product are 9 × 9 × 8 × 9 = 5832. 731671765313306249192251196744265747423553491949349698352031277450632623957

1. Two Sum Leetcode PythonGiven an array of integers, find two numbers such that they add up to a specific target number.The function twoSum shocould return indices of the two numbers such that they add up to the target, where index1 must be less

Euler's plan (python) problem 5Smallest multipleProblem 5 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that isEvenly divisibleBy all of the numbers

Python learning: Object-oriented I. first look at a program A = [1, 2, 3] B = a B [0] = 0 print bprint Can you guess the execution result? Let's execute: [0, 2, 3] [0, 2, 3] Why? We only modified the values of the B set. Why does a

Other Python languages and python languages Python itself, as a programming language, has multiple implementations. The implementation here refers to the Python interpreter and standard library conforming to the Python language specifications.