Python

1. Read the contents of the fileImport CodecsF=codecs.open (' 1.txt ', ' RB ')Print (F.read ())F.close ()2. Write a new fileImport CodecsF=codecs.open (' 2.txt ', ' WB ')F.write (' Hello World ')F.close ()Special usage of 3.WithImport CodecsWith

Chicken soup:Ideal, you are like a flower in the severe winter not blooming plum blossom, your life in the sky of the snow is so small, so fragile. As if a gust of north wind blows, can blow you to the best. Will you wither if you never bloom? Never

One or three-tuple operator# when the condition is met 1 o'clock, the res= value is 1; otherwise res= value 2 if Else value 2To illustrate:res=10# Simple If Else statement if abs (res) >0: = 10**2else: Res =0# implemented with ternary

Nonsense not much to say directly on the codeFrom turtle import *import timesetup (600,800,0,0) speed (0) Penup () Seth (+) FD (340) Seth (0) Pendown () speed (5) Begin_fill ( ) FillColor (' Red ') circle (50,30) for I in range: FD (1) Left (40,40)

Read the file Three step: Import Module codecs# codecs module is mainly used for the end file garbled problem. Import codecs1, open file 2, file operation (read or write) 3, close file F = codecs.open (' 1.txt ') Text = f.read () result =

Definition: ' yum ' command-line interface. Yummain. Main (args) Run the Yum program from a command line interface. Yummain. Hotshot (func, *args, **kwargs) profile the

1, through the language features to achieve:For I in Range (0,100): When True: try: # do stuff except somespecificexception: continue Break　2, through the third-party library implementation:Pip Install

two weeks four sessions (October 26)Review and do the following exercises1. Achieve 1-100 of all and2. Achieve 1-500 of all odd and3. Ask for 1+ 2! + 3! + 4! + ... 20! and the4. Sort the specified list [2,32,43,453,54,6,576,5,7,6,8,78,7,89]5. Review

What is a function of PythonWe know that the area of the circle is calculated as:S =ΠR2When we know the value of radius r, we can calculate the area based on the formula. Suppose we need to calculate the area of 3 circles of different sizes:R1 = 12.3

Since the beginning of Python2.6 , a new function of format string str has been added. format ()GrammarIt replaces% with {} and:.Map sampleby locationIn [1]: ‘{0},{1}‘.format(‘kzc‘,18) Out[1]: ‘kzc,18‘ In [2]: ‘{},{}‘.format(‘kzc‘,18) Out[2]: ‘kzc,18

1. CollectionA collection is an unordered, non-repeating combination of data, and its main functions are as follows: Go to the weight, turn a list into a set, and automatically go heavy. Relationship test, test the intersection of two

Python Practice Questions:#/usr/bin/python#coding =utf-8# @Time: 2017/10/26 9:38# @Auther: Liuzhenchuan# @File: exercises. PY #实现1--100 All the numbers andsum = 0 for i in xrange(1,101): sum + = iprint sum >>> 5050 #实现1--500 All the odd

1. Common string manipulation1Name ='My name is Druid'2 3 Print(Name.capitalize ())#Capitalize first letter4 Print(Name.count ('D'))5 Print(Name.center (50,'-'))#A total of 50 characters are printed, the string is placed, and the bits are not enough-

First look at a chestnut:Let's take a look at the I/O cheats thread, for a chestnut-crawler, below is the climb down the picture with 4 threads to write a file1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 4 ImportRe5 ImportUrllib6 ImportThreading7

Example of file change monitoring in python (watchdog ), In python, file Monitoring mainly has two libraries: pyinotify (https://github.com/seb-m/pyinotify/wiki) and watchdog (http://pythonhosted.org/watchdog ). Pyinotify depends on inotify on Linux,

How to solve the "IndentationError: unexpected indent" error in python, Solution to the "IndentationError: unexpected indent" error in python Python is a language that is very sensitive to indentation. The most common situation is that mixed tabs

Using python to batch modify word file names, Preface Recently, I accidentally formatted the hard disk. Because the files were not backed up at the time, all the files were lost, so I had to take remedial measures, some data is recovered using the

Analysis of int () function usage in Python, pythonint Int () is an internal function of Python. This is what we say in the Python help. >>> help(int) Help on class int in module __builtin__: class int(object) | int(x[, base]) -> integer | |

How to Use the timer timeit in python, And the python timer timeit This article describes how to use the timer timeit in python. The details are as follows: Timeit Usually time. time () is used before and after a program, and then subtract to get

Introduction of requests using proxy proxies in python, requestsproxies To learn how to use a proxy for web crawlers, we will introduce how to use requests to set a proxy: To use a proxy, you can configure a single request by providing the proxies