Python

Import pandas as pddef getempdataframe (num):          ' Create a reusable data with a certain randomness and authenticity '          #员工编号      emp = ["] * num    lennum = len (num))      for i in range (num):         emp[i] =  str (i+1). Zfill

1. JSON string is2, need to be introduced in advance, that is, import3. Convert list/dictionary to JSON data type: Json.dumps ()#json. Dumps (d) #把list \ Dictionary to JSON#json. Dumps (d,indent=8) #把list \ Dictionary into JSON, indent

Practice using Python to write two-dimensional code applet;Need to install Python's QR code library--QRCodePip Install QRCodeThe code is as follows:#Coding=utf-8ImportQRCode#a = Qrcode.make (' http://www.baidu.com ') #默认生成的二维码#a.save (' QR code _

From ABC import Abcmeta, abstractmethodfrom enum import enumclass person (Metaclass=abcmeta): @abstractmethod def get_name (self): raise Notimplementederror ("You should implement this!") Class Villager: def get_name (self):

Data Type-DictionaryA dictionary is a Key-value data type, used as a dictionary of our school, to check the details of the corresponding page by strokes and letters.Characteristics:Key-value structureKey must be hash, must be immutable data type,

This is the content of the December plan, beginning in January 2018 ~If there is any mistake, please ask for it ~Tuples use parenthesesNote When there is only one element in a tuple that contains only one element, you need to add a comma after the

1. Time# 1, Format good time 2018-1-14-16:42# 2, timestamp is the number of seconds from UNIX to now# 3, Time tuple# If you want to convert time stamps and formatted time to each other, you must first turn to a time tuple before you can turn1 #Print

16dayExercise: Simulate landing1, user input account password for landing;2, the user information is kept in the document;3, the user password input error three times, lock the user, the next login, detected that the user can no longer

What is an adorner? Adorner: Essentially a Python function (a function in Python is an object)that allows other functions to add extra functionality without any code changes , and the return value of the adorner is also a function object.

Python calculates the square root using the dichotomy methodFrom math import sqrtdef mysqrt (num,small):     assert num>0     assert small>0    low = 0.0     high = max (num,1)     loops=1    while True  and loops  num:            high = a 

Data type, ListFunction:Create: Empty List A = [] Non-empty List A = [' Alex ', ' Jack ', ' Ella ', ' mark '] b = a.copy ()Query: Finds an element by index, the index is found by an element,Slices: Default Gu Tou regardless of tailAdded: Append

Google and pythongoogle Mark the website at the beginning: goole Official Website Programmers in any language compile code that complies with the specifications, which is the first step in their programming career.I. semicolon Do not add points at

Python Machine Learning Theory and Practice (2) Decision Tree and python Learning Theory Decision Trees are also supervised machine learning methods. There is a game in the movie "no shame asshole", where several people are playing the 20-Question

Crawler parsing database ----- re, beautifulsoup, pyquery, I. Introduction Beautiful Soup is a Python library that can extract data from HTML or XML files. it enables you to navigate, search, and modify documents by using your favorite converter.

Python converts doc files to pdf files, pythonpdf This document describes how to convert a doc to a pdf file in Python. We will share this with you for your reference. The details are as follows: #-*-Coding: UTF-8-*-# doc2pdf. py: python script to

Python crawls web page data and stores it in the mysql database, pythonmysql # Python 3.5 from urllib. request import urlopenfrom urllib. request import urlretrievefrom bs4 import BeautifulSoupimport pymysqlconn = pymysql. connect (host = '2017. 0.0

Chapter 3 python3, python3 The python official website describes the set as follows: Python also includes a data typeSets. A set is an unordered collection with no duplicate elements. Basic uses include membership testing and eliminating duplicate

Zookeeper python interface instance details, zookeeperpython This article describes how to install and use python to support the zookeeper interface library. Zk's python interface library includes zkpython and kazoo. The following is zkpython, which

Basic use of sqlalchemy and sqlalchemyI. Introduction to ORM The full name of orm is object relational ing, which is an object ing program. In simple words, we use object-oriented programs like python, but the databases we use are relational, to

Python time module, pythontime 1 import time 2 3 #2 methods to indicate time: 4 # (1) timestamp, starting from 1970.1.1 5 # (2) A 9-integer tuples 6 # the content of this tuples: 7 # year (including century, e.g. 1998) 8 # month (1-12) 9 # day (1-31)