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1, Static routing urlpatterns attribute urlpatterns is a global variable in the routing file, which is used to store the mapping relationship between routing and view functions The request URL initiated by the user will first enter the URLs under the main control directory Py file First find URLs The urlpatterns global variable under py, wh ...

1.reshape reshape is reshaping. Three commonly used expressions are as follows: numpy.arange(n).reshape(a, b) # n natural numbers are generated in turn and displayed in the form of an array of rows a and columns b numpy.arange(a,b,c) # Starting from the number a, the step is c, and ending at b, the array is generated numpy.ara ...

catalogue 1. Join() function splicing: sep.join (iterable) 2. Case conversion: (1) Method upper (): converts lowercase letters to uppercase letters. (2) Method lower(): converts uppercase letters to lowercase letters. (3) Method title (): the first letter of all words is uppercase, and the rest are lowercase (4) Method capitalize(): conve ...

Python is a scripting language. Compared with C/C + +, it has some shortcomings in efficiency and performance. However, there are many times when the efficiency of Python is not as exaggerated as expected. Let's move on to the topic. 1. Code optimization principle This article will introduce a lot of techniques to speed up the running of ...

preface 1, What is the list 1. Access list elements 2. Index starts from 0 instead of 1 3. Use the values in the list 2, Modify, add, and delete elements 1. Modify list elements 2. Add elements to the list 3. Remove the element from the list 3, Organization list 1. Use the method sort() to permanently sort the list 2. Us ...

1. Declare exception syntax rules Try finally statement try: Detection range except Exception[as reason]: An exception occurred( Exception)Post processing code finally: Code that will be executed anyway A try statement can be matched with multiple except statements, because there may be multiple types of exceptions i ...

Automatic timing transmission through selenium Look at the overall code more. In fact, it's not much or difficult. It's just that I have a lot of code comments (my habit). Sorry, the content of the article may be a little too much. In fact, I spend more time writing blog than writing code! Let me be long winded. First use the trumpe ...

Contents of this chapter: Types of PythonPython environmentIntroduction to Python (interpreter, coding, pyc file, step input parameters, variables, input, process control and indentation, while loop)Exercises Types of Python Cpython The official version of Python is implemented in C language, which is the most widely used. CPython implement ...

Basic overview of image retrieval Since the 1970s, the research on image retrieval has begun. At that time, it is mainly text-based image retrieval technology (TBIR), which uses the way of text description to describe the characteristics of images, such as the author, age, genre and size of paintings. After the 1990s, image retrieval techn ...

Time series analysis - 23 DTW (time series similarity measurement algorithm) Preliminary study on DTW brief introduction In time series analysis, DTW(Dynamic Time Warping) is an algorithm used to detect the similarity of two time series, which is usually represented by a distance. For example, the following two sequences, ...