one, sys moduleSYS module is a module that interacts with the Python interpreter and is commonly used in the following waysSYS.ARGV: Used to receive parameters from outside the program while the program is running, if the parameter is not passed, the program's file name is displayed.Import sysname=sys.argv[1]password=sys.argv[2]if name== ' jly ' and password== '
difference between the string and the string is: This string is a double quote, and the string is a single quote Json.loads (the data that was Json.dumps): the deserialization process. 2, write the file. Json.dump (obj, fq) obj = object, Fq = File handle. The serialized string is written to the file Json.load (FQ) FQ = file handle, read, deserialized String, PS: Writes multiple serialized strings to the file and then deserializes, an error occurs. If you really want to write more than one,
When a third-party module is installed on the window platform, the following error occurs:
Only after Google clicks below can we know that this module is missing in Python.
We can go to the Python official website to find
In the Package Index, check the required modules and download and install them.
Refer to the fol
Python modulePython code can be stored in a file, for some scripts or interactive interpreter instances, this file is called a module.A module is a file that contains all of the functions and variables that you define, followed by a. PY module that can be introduced by other programs to use functions such as functions in the
I. Overview of OS ModulesThe Python OS module contains common operating system features. This module is especially important if you want your program to be platform-agnostic.Second, common methods1, Os.nameThe output string indicates the platform being used. If the window is ' NT ', it is ' POSIX ' for Linux/unix users.2, OS.GETCWD ()The function gets the current
1.1 Python OS. Path Module
OS. Path. abspath (PATH) # returns the absolute path.OS. Path. basename (PATH) # returns the file name OS. Path. commonprefix (list) # returns the longest path of all paths in List (multiple paths. OS. path. dirname (PATH) # returns the file path OS. path. exists (PATH) # True is returned if the path exists, and falseos is returned if the path is damaged. path. lexists # If the p
Python's random module and Pythonrandom Module
The random module in Python is used to generate random numbers. The following describes the most common functions in the random module.
Generate a 4-digit Verification Code randomly:
Import randomcheckcode = ''for I in range (4)
Python calls the fortran module and pythonfortran module.
The f2py program is used to call the fortran code in python. Its project home page is here. Now the project has been merged into numpy. Install python and then install numpy to use f2py. However, for windows, you must
Python provides several built-in modules for manipulating date times, like Calendar,time,datetime. Time module I have described in the previous article, it provides the interface and C standard library time.h basically consistent. The interface of the DateTime module is more intuitive and easier to invoke than the time module
Python Time module and datetime module detailedOriginal: http://www.cnblogs.com/tkqasn/p/6001134.htmlOne, Time moduleThere are three types of time-performance formats in the Times module:A, timestamp timestamp, which represents the offset calculated in seconds from January 1, 1970 00:00:00B, struct_time time tuple, a total of nine element groups.C, format time fo
SYS module's functionSYS is a more commonly used module in Python, and provides operations on the environment where the Python script runs.SYS function:1 sys.argv #将python脚本运行时的脚本名以及参数作为一个list, and output.#test_py.py File#/usr/bin/python3ImportSYSPrint('The script name is:', sys.argv[0])ifLen (SYS.ARGV) > 1: Print("
Look at python multithreading ------ threading module, pythonthreading Module
Now let's record the notes that can be thought of with multithreading:
Threading module:
1. Questions about parameter passing
If the called sub-thread function requires passing parameters, add "," next to the parameter. Otherwise, a parameter
Python random module, pythonrandom Module
Copy codeThe Code is as follows:Import randomPrint random. random ()
Obtains a floating point number smaller than 1.
Copy codeThe Code is as follows:Import randomRandom. randint (1, 10)
Returns an integer from 1 to 10.
Copy codeThe Code is as follows:Import randomPrint random. uniform (0, 2)
Obtains a floating point numbe
Use of python Tqdm module and pythontqdm Module
Tqdm is a fast and scalable Python progress bar. You can add a progress prompt in the Python long loop. You only need to encapsulate any iterator tqdm (iterator ).
My system is a Windows environment. First install
Using the urllib or urllib2 module that comes with Pyhton to Capture webpages may be a bit lazy. let's take a look at some new things today. let's take a look at the tutorial of using the lxml module and the Requests module to capture HTML pages in Python:
Web capture
The Web site uses HTML description, which means t
In general, Python does not include the OpenCV module, need to install or configure their own, installation is relatively simple I will not say, say the download module, hands-on configuration (because the LZ is Winpython, green version of non-installation, although the integration of a lot of modules, but Wood has OPENCV, Can not be installed directly, can only
1. Random (self):
Get the next random number in the range [0.0, 1.0)
Take 0 to 1 random floating-point numbers directly
import random
print (random.random ())
C: \ python35 \ python3.exe D: / pyproject / day21 module / random random module.py
0.3105503800442595
2, Randint (self, A, b)
Return random integer in range [A, b], including both end points.
Returns a random integer between a A and a, includi
#! /usr/bin/env python#-*-Coding:utf-8-*-#JSON (JavaScript object Notation, JS tag) is a lightweight data interchange format.# The JSON data format is actually the dictionary format in Python, which can contain arrays enclosed in square brackets.# in Python, there are modules--json and Picle modules that specialize in JSON format# Python's pickle
I. Overview of OS ModulesThe Python OS module contains common operating system features. This module is especially important if you want your program to be platform-agnostic. (in one's language)Second, common methods1, Os.nameThe output string indicates the platform being used. If the window is ' NT ', it is ' POSIX ' for Linux/unix users.2, OS.GETCWD ()The funct
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