Python

List parsing Syntax format:First format:[Expr for Iter_var in iterable]Iterate over each element in the iterable, and each iteration of it, puts an element into the Iter_var. The contents of the Iter_var are then applied in the expression

InheritedThe implication of inheritance is that subclasses inherit the namespace of the parent class, which can invoke the properties and methods of the parent class, and because of the way the namespace is found, when the child class defines the

Python's unit Test framework Pyunit is very similar to that of Java, and here's an example of unit testing of the methods in the module:Implementation code: Enter a list of integers to determine if there are duplicate numbers, or return False if

Prerequisite: First make sure that Python is already installed on your computer, and then configure the Python environment variables. For example: The module I want to install is XLRD1. Copy the package you want to install into the Python

The Zen of Python, by Tim PetersBeautiful is better than ugly.Explicit is better than implicit.Simple is better than complex.Complex is better than complicated.Flat is better than nested.Sparse is better than dense.Readability counts.Special cases

The definition of a variable:The first occurrence of a variable is either a declared type or an initial value for subsequent use.Definition of the function: " " The return value of a function is preferable to assigning a type value

Anyone who has ever used Python is basically aware that entering import this in the interactive interpreter will show Tim Peters's The Zen of Python, but its gatha-like statement is a bit confusing, so I'd like to share my experience with it and

First, using the PDBPython-mpdb script.pySecond, using GDBTo configure GDB Pythin support First, the following steps are required:1, modify the Python-2.6/misc/gdbinit, will while $_i f_nlocalsRevision changed to while $_i f_code->co_nlocals2, in

Find all sub-files under a folderImportOsallfile=[]defdirlist (path): FileList=os.listdir (path)#FPATH=OS.GETCWD () forFileNameinchfilelist:#allfile.append (fpath+ '/' +filename)Filepath=Os.path.join (path,filename)ifOs.path.isdir (filepath):

#Encoding=utf-8classA (object):def __init__(self):Print "Initialize a" defRun (self):Print "Run a"classB (A):def __init__(self):Print 'Start initialization B'Super (B, self).__init__() Print 'End of Initialization b' defRun (self):Print

Let's look at a simple function.1 def Calc_sum (1st):2 def lazy_sum ():3 return sum (1st)4 return Lazy_sumAt this point it is not able to move the lazy_sum to the outside of the calc_sum because it references the calc_sum parameter lst.Such an

Http://www.cnpythoner.com/post/308.htmlhttp://www.cnpythoner.com/post/308.htmlThese three words appear in the Python class, and the self and the CLS can be replaced by other words, and there are three methods of the class.One is defined by Def, the

Range (0,100)Xrange (0,100)Can generate the specified range of data, range will be a list of numbers, Xrange will delay the generation, and then large data processing time compared to save performance.Try to use Xrange ()Range: Generates a list

Learn the "father and child Programming Journey" Chapter 16, with the example of the book to learn, learned to draw a circle, I found a way to draw the line, so you can draw the Japanese flag on screen:Hand animation is not good to see, you can also

Conversion of RGB values to images (python PIL ), Today, I saw a misc question. To obtain a txt file with an RGB value, I need to convert the RGB value to an image. Specific question: here For the first time I encountered this type of question, I

5. Python 5. Functional Programming Recently, Python has been learned slowly, and the recent learning attitude and learning efficiency are indeed poor. At present, this situation is improving. Today, I will give you a brief summary of functional

Reading csv files in Python contains Chinese Characters When reading csv files in Python contains Chinese characters, the following error occurs:When reading:    Import sys Reload (sys) # Chinese errors Sys. setdefaultencoding ("UTF-8 ")  

Python debugging method and python debugging 1. Use pdb Python-mpdb script. py   Ii. Use gdb Configure the support for gdb pythin as follows: 1. Modify Python-2.6/Misc/gdbinit and set While $ _ I f_nlocals Change While $ _ I f_code->

Python specifies the method for regularly executing the specified function. This example describes how to regularly execute a specified function in python. Share it with you for your reference. The specific implementation method is as follows: #

Python zip and unzip data methods, pythonunzip This document describes how to use python zip and unzip data. Share it with you for your reference. The specific implementation method is as follows: # zipping and unzipping a string using the zlib