Python

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 #li = ["Computer", "U Disk", "Mouse", "yacht"]4 #For item in Li:5 #print (item)6 #Input = input ("Please enter Product:")7 8 #enumrate automatically generates a column, default 0 self-increment 19

#r mode, default mode, file does not exist error#w mode, file exists overwrite, file does not exist then create#a mode, the file does not exist is created, the file exists does not overwrite, the write content is appended to the way.#file processing-

# Set Console output font Color # format: \033[display, foreground color, background color m# with terminal default: \033[0m# red print (' \033[1;31m ') print (' * ' *) print (' Hello world! Print (' * ' *) print (' \033[0m ') # Green font print (' \

data = {"Beijing": {"Changping": {"Shahe": ["Oldboy", "Test"], "Tian Tong Yuan": ["Link Property", "I love my Home"]},"Chaoyang": {"wangjing": ["Mercedes-Benz", "Mo Mo"], "Guomao": ["CICC", "HP"], "dongzhimen": ["Advent", "Fetion"]},"Haidian":

1. First open the CMD window and execute the following command to install the ReadLine modulepython-m pip Install Pyreadline2, Write tab.py1 #python Tab2 ImportSYS3 ImportReadLine4 ImportRlcompleter5 Importatexit6 ImportOS7Readline.parse_and_bind

Functional Knowledge Review:The parameters of the function are: arguments and formal arguments.Arguments: Parameters passed in when the function is called;Formal parameters: Divided into 3 types (positional parameters, default parameters, dynamic

Where the co-process comes in Concurrency of large systems and easy to bottleneck in IO (disk IO, network IO), multi-threaded, multiple processes can solve this problem, of course, thread, process switching is very resource-intensive. The

Note : Python has several ways of parsing XML, and the following "ET" represents the Library "ElementTree" (Import Xml.etree.ElementTree as ET)1. Et_tree = Et.parse (' Xxx.xml '): The parameter is a stream object or file name that returns an entire

import Sys,time # import module for i in Range (50 # The length of the progress bar Sys.stdout.write ( " # " ) # The contents of the progress bar, it is important to note that Pycharm may not show the method of the write

Exercise 14: Tips and DeliveryLet's use argv and raw_input to ask the user some special questions. Next exercise you will learn how to read and write files, this exercise is the basis of the next section. In this exercise we will use raw_input in a

# random various ways to use import random# random generate [0.1] floating-point number print ("Random ():", Random.random ()) # randomly generates an integer between 1000-9999 and print ("Randint ( (9999): ", Random.randint (1000, 9999)) # randomly

When you read a file, you often need to traverse the folder, and Python's os.path contains many ways to manipulate files and folders. Listed below:Os.path.abspath (Path) #返回绝对路径os. Path.basename (Path) #返回文件名os. Path.commonprefix (list) #返回多个路径中,

In Python, the Chinese is not displayed by default, as in the following code:[Python]View PlainCopy Import Matplotlib.pyplot as Plt # define text box and arrow formatting Decisionnode = dict (Boxstyle = "Sawtooth", FC = "0.8") Leafnode

The content of this section list, tuple operations String manipulation Dictionary operations Collection operations File operations Character encoding and transcoding 1. List, tuple operationsThe list is one of the

To write the login interface:Enter username and user nameAfter successful authentication, display welcome informationAfter the authentication fails 3 times, exit the programWrite a loop, the important ideas clear, must need a logical

namespace of the functionThe famous Zen of PythonBeautiful isBetter than Ugly. Explicit isBetter than Implicit. simple isBetter than Complex.complex isBetter than Complicated. Flat isBetter than Nested. Sparse isBetter than Dense. Readability Counts.

Python namedtuple (named tuples) using instances#!/usr/bin/python3import Collectionsmytupleclass = collections.namedtuple (' mytupleclass ', [' name ', ' age ', ' job ']) obj = Mytupleclass ("tomsom", page, ' cooker ') print (obj.name) print

Python _ web crawler (SINA news capture), python Sina news Preparations before crawling: BeautifulSoup import: pip install BeautifulSoup4 Import requests: pip install requests Download jupyter notebook: pip install jupyter notebook

Tornado study notes, tornado Import tornado. ioloopimport tornado. webclass MainHanlwe (tornado. web. requestHandler): def get (self): login_user = self. get_secure_cookie ('login _ user', None) if login_user: self. write (login_user) else: self.

Python-bubble algorithm, python bubble Bubble algorithm: For the sequence to be sorted, the two elements are compared each time. If the sorting is incorrect, the two elements are exchanged until the sorting is completed.   Take the series li = [,]