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This article describes the Replace method in Python in the form of an instance, which is very useful, as follows:
There are two main types of replace methods:
Last_date = "1/2/3" target is "123"
Method One: Repalce
Date =last_date.replace ('/', ')
Method Two: RE
p = re.compile ("/")
date = P.sub (", last_date)
Note that you must not escape, or the function will not take effe
Python psutil module simple use example
This article mainly introduces the Python psutil module's simple examples. This article provides a script to view cpu information, memory information, system startup time, and network card information, for more information, see
Easy to install
The Code is as follows:
Pip install psutil
Official website address:
Https://pyth
This article mainly introduces the string replacement operation example in Python, including using the string template. template example and a regular expression example. if you need a regular expression, you can refer to the string replacement (interpolation). you can use string. template, you can also use the concate
To the Python automation compared to the classmate, many understand some reptile method, some also study very deep, below IA simple reptile example, for your reference. Of course there are many needs can be re-learning, download progress of the displayInstructions, download the completed prompts, and more.First, we have to study the structure of the crawler site,
There are two ways to implement multithreading in Python: function, Thread Class 1. The function calls the Start_new_thread () function in the thread module to create a thread that tells the thread what to do in the form of a thread function#-*-Coding:utf-8-*-import threaddef F (name): #定义线程函数 print "This is" + name if __name__ = = ' __main__ ': th Read.start_new_thread (F, ("Thread1",)) #用start_new_thread () call thread functions and other parame
In this article we are going to go into details about
Regular ExpressionsAdvanced knowledge, and I'll come up with some of the problems that might arise in Python programming.
examples of regular expressions.
First advanced point of knowledge:
Slicing a string
Using regular expressions to slice a string is more flexible than a fixed character, see the normal segmentation code:
>>> ' a B c '. Split (')
[' A ', ' B ', ', ' ', ' C ']
Well, you can't
In the process of development, you may often encounter a requirement that requires the output of Python's exception information to a log file.
Online methods are not very practical, the following is a practical, from the Python 2.7 source code to buckle out.
The nonsense does not say directly on the code, the code is not many, the annotation is more than just.
Import sys, tracebacktraceback_template = "Traceback (most recent call last): File"% (file
[i]) if (classifierresu Lt! = Datinglabels[i]): ErrOrcount + = 1.0 print "The total error rate is:%f"% (Errorcount/float (numtestvecs)) Print error count def img2vector (filename): Returnvect = zeros ((1,1024)) FR = open ( FileName) For I in range (+): LINESTR = Fr.readline () F or J in range (+): RETURNVECT[0,32*I+J] = Int (linestr[j]) RETURN RET Urnvectdef handwritingclasstest (): hwlabels = [] trainingfilelist = Listdir (' trainingDigits ') #load the training
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