Python

One, Python versionThe Python version is divided into 2 series and 3 series, but most enterprises now use the 2 series version, but the 3 Series Python version has become a trend, so this blog mainly in the 3 series of Python version mainly.Second,

Implement GEO/inverse address coding with the high-de Map Web Service APIFor more details on how to use the API, see official documentationDocument URL: http://lbs.amap.com/api/webservice/guide/api/georegeo/1. Using Python's third-party library

See machine learning to see the regression function, see half can not go down, see to be able to use the variance function regression, and hand itch, oneself push Formula write code verification:the common least squares method is the first order

Sockets are an abstract concept of network programming.Usually we use a socket to indicate "open a network link", while opening a socket needs to know the destination computer's IP address and port number, and then specify the protocol type.Socket

First, Exception introductionIi. Types of anomalies1 Attributeerror attempts to access a tree that does not have an object, such as foo.x, but Foo has no attribute x2IOError input/Output Exception: Basically, the file cannot be opened3 Importerror

The benefit of using the generator is obvious, it can make the code clearer, while reducing the memory consumption, when the function needs to return the list, it is relatively easy to rewrite the function as a generator.The following two functions

1. Strip () functionStrip () is the deletion of the characters inside the ' () ', and when () is empty, the default is to remove the whitespace (including ' \ n ', ' \ R ', ' \ t ', ')(1) S.strip (RM) Remove the characters from the beginning and end

This script is grounded to provide the idea, a word explosion speed up 1000 times times, read his post but did not see the tool, thinking very good, I provide a Python scriptLocal test, 100,000 password only need 3 seconds, speed is still

1 #-*-coding:utf-8-*-2 3 fromPILImportImage4 fromPylabImport*5 6 defcompare_pic_l (pic1,pic2):7 #Open the first picture8IM1 = Image.open (PIC1). CONVERT ('L')9 PrintIm1.format, im1.size, Im1.modeTen One #pixel value to array AAIM1

When you learn python, you will inevitably install a third-party module using PIP in this way. This is a convenient way to install the PIP online, but often there is a slow download due to network reasons. Using a domestic mirror is relatively

The nested function defines a function inside the function with Def, as follows:def test ():Print (' This is Test function ')Def test2 ():Print (' This is test2 function ')A nested function can only be called inside a functionInstancex = Grandpa ():

Coding problems are often encountered when coding with Python, Unicodeencodeerror: ' ASCII ' codec can ' t encode characters in position 0-1: Ordinal not in range (128) , in fact, coding problems can be solved by decode and encode.The representation

# -*- coding:utf-8 -*-nhj#  author:linimport timeuserna,passwd =  ' Lin ' , ' abc123 ' Def authentication_method (auth_val):     print (' this is  Authentication method ')     def out_wrapper (func):         def wrapper (*args,**kwargs):             

The Python and Pycharm development environment has recently been installed, but there has been a problem installing packages such as NumPy and Matplotlib, and now summarizes the installation methods under the Windows platform.The installation of the

Def func1 (): Try:return float (' abc ') except Valueerror,e:print edef Func2 (): Try:astr = ' ABC ' float (astr) except valueerror:astr = None return astrdef func3 (): TRY:ASTR = ' abc ' Float (astr) except valueerror:astr = ' count not

To achieve the effect of multiple iterators, __iter__ () simply defines the new state object for the iterator instead of returning the self1 classskipiterator:2 def __init__(self, wrapped):3self.wrapped =Wrapped4Self.offset =05 6 def __next__

1. Basic concepts of Python and basic concepts of python 1. Number Python has four types of numbers: integer, long integer, floating point, and plural 2. String Character Sequence in single, double, or triple quotes, for example: 'Char '#

Flask + sqlite3 + echarts2 + ajax data visualization, flasksqlite3 Prerequisites: Prepare the Python + Flask + Sqlite3 platform environment (windows) The previous section describes how to install flask. After sqlite3 is downloaded, decompress the

Zip function-Python 3, zip function-python The zip function accepts any number of (including 0 and 1) sequences as parameters and returns a tuple list. The zip function is easier to generate a dictionary (dict) after obtaining data.  For examples:

Add tab completion and pythontab completion in python It is quite convenient to use the tab to complete the Python method. 1. The mac platform configuration is as follows: Mac is a Unix-like platform. You need to add a configuration