Programmer Group

   when using python to process data, sometimes large data sets may be encountered, and the problem of Memory Error may occur. After my attempt, I summarize the following schemes: 1. Modify the length of data type   modify the length of the data type to compress the data in memory, so as to reduce the occupation of memory. imp ...

demand Source data acquisition – password: 6qpt Import the file and view the original dataCombine population data with state abbreviation dataDelete the duplicate abstraction column in the merged dataView columns with missing dataFind out which states / regions make the value of state NaN and perform the de duplication ope ...

1 Preface Hi, everyone, this is senior Dan Cheng. Today, I'd like to introduce you to a python web project (currently demo, under development.) Parking lot management system based on big data analysis (currently demo, under development.) You can use it for graduation design 2 system effect 3 Preface The current project is a park ...

Data structure of Pandas Import pandas from pandas import Series 1,Series Series is an object similar to a one-dimensional array, which consists of the following two parts: values: a set of data (darray type)Index: related data index label 1) Creation of Series There are two creation methods: (1) Created from a list or numpy array, the ...

preface 🔗 Running environment: Python 3🚩 Author: Classmate K📚 From column: Matplotlib tutorial🧿 Excellent column: Introduction to Python 100 questions🔥 Recommended column: Introduction to Xiaobai deep learning🥇 Selected columns: 100 cases of deep learning Everybody, I'm classmate K! Recently, a film "Changjin Lake" ha ...

1, Preliminary understanding of Matplotlib 1. What is Matplotlib? It is specially used to develop 2D charts (including 3D charts)Realize data visualization in a progressive and interactive way 2. Matplotlib three-tier structure (1) Container layer Canvas: a tool for placing a canvas (Figure), which acts as a sketchpad Figure: ac ...

Advanced component does not mean how "advanced" the component is, but means powerful. If you want to realize a fully functional table function, it may take several days to write a lot of code. You can call the wx.Grid component directly and do it in three or two times, so this component is very advanced. Common advanced components of ...

In most programming languages, the menu bar and toolbar will provide the corresponding layout, and the layout manager is required for the of the work area. Of course, in PyQt5, most components can be positioned and placed with x-axis and y-axis coordinates, but it takes time and effort. There will also be problems that the size and position of ...

Catalog 1. Decision Tree Model Data Classification 2. Decision tree pruning alleviates over-fitting problems *Common decision tree algorithms are ID3, C4.5, and CART. The ID3 algorithm, proposed by Quinlan, an Australian computer scientist, in 1986, is one of the classic decision tree algorithms. The ID3 algorithm uses information gain to s ...

Overall user shopping What are pv (total visits), average daily visits, uv (total number of users), the number of users with purchase behavior, the shopping situation of users and the repurchase rate? User behavior transformation funnel How about the conversion rate of click Add shopping cart purchase links? What is the abandonment rate of s ...