Data structures and algorithms (Python)
1. Introduction of concepts
If a+b+c=1000 and a2+b2=c^2 (a, b and c are natural numbers), how to find all possible combinations of a, b and c?
start_time = time.time()
# Note that it is a triple cycle
for a in range(0, 1001):
for b in range(0, 1001): ...
Added by CreativityLost on Wed, 06 Oct 2021 17:56:33 +0300
Everything is an object
First, let's understand the functions in Python:
return "hi " + name
# output: 'hi yasoob'
# We can even assign a function to a variable, such as
greet = hi
# We don't use parentheses here because we're not calling the hi function
# Instead, you're putting it ...
Added by Hannes2k on Wed, 06 Oct 2021 17:29:03 +0300
When I first entered the world of mortals, I didn't know the suffering of the world, When I look back, I am already a bitter man. One third of the wine in this glass, This wine is sad. Shut it down, shut it down, It's hard every night. May love and hatred in this world melt into wine, Turn this dust into wine A drink to relieve your worries!
Added by Matt Phelps on Tue, 05 Oct 2021 22:54:04 +0300
Learn about news topic classification and relevant data Master the implementation process of constructing news topic classifier using shallow network About news topic classification tasks:
Taking the text description content of a news report as the input, the model is used to help us judge which type of n ...
Added by ragear on Tue, 05 Oct 2021 22:26:59 +0300
The tree structure is implemented through QTreeWidget and qtreewidgettitem classes, in which qtreewidgettitem class implements the addition of nodes. QTreeWidget is a hierarchical nested structure. The outer and inner layers of a tree structure have similar structures. It is often used to represent a data structure with one upper layer and mult ...
Added by fangfang on Mon, 04 Oct 2021 23:22:54 +0300
The Matplotlib library is a package used in Python to draw pictures, which can be used to quickly draw the desired image
2.quick get start
(2) Subgraph and Subgraph Layout
(3) Name of coordinate axis and scale
Coordinate axis range
(4) Legends and text lab ...
Added by SquirrelJ on Mon, 04 Oct 2021 20:17:05 +0300
The table control also has a QTableWidget, which inherits from QTableView. The main difference between QTableWidget and QTableView is that QTableView can use custom data model to display content, while QTableWidget can only use standard data model, and its cell data is realized through qtablewidgettitem object. In general, using QTableWidget ca ...
Added by dbrown on Mon, 04 Oct 2021 05:57:34 +0300
What is K-nearest neighbor algorithm?
K-nearest neighbor algorithm (KNN) is one of the classification algorithms. KNN classifies new data by calculating the distance between new data and data points of different categories in historical sample data. Simply put, it is to classify and predict the new data through the k data points closest to the ...
Catalogue of series articlespreface1, What is the k-nearest neighbor algorithm?2, Use steps
1. Import and storage2. Read in datasummary
With the continuous development of artificial intelligence, machine learning technology is becoming more and more important. Many people have started learning machine lea ...
Added by schilly on Sun, 03 Oct 2021 22:20:09 +0300
Definition of function
Remember "Everything is an object" in Python? Python treats functions as objects and can return from another function to build higher-order functions, such as: parameters are functions and return values are functions.
Let's start with the definition of a function.
The function begins with the def ke ...
Added by Anidazen on Sun, 03 Oct 2021 19:54:33 +0300