How to use the Webman framework to implement data visualization and report generation functions?-Workerman-php.cn

How to use the Webman framework to implement data visualization and report generation functions?

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Release： 2023-07-07 15:52:37

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How to use the Webman framework to implement data visualization and report generation functions?

With the rapid development of big data and the Internet, data visualization and report generation have become the needs of many companies and individuals. The Webman framework is an open source Python web development framework that provides features and a rich view library for quickly building web applications. In this article, I will introduce how to use the Webman framework to implement data visualization and report generation functions.

Install the Webman framework

First, we need to install the Webman framework. You can install Webman through the pip command:

pip install webman

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After the installation is complete, you can use the following command to check the installation of Webman:

webman version

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Create a Web application

Before we begin, we need to create a web application. Open a terminal and execute the following command:

webman start myapp

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This will create a project directory called myapp and generate some basic file and directory structure in it.

Data Visualization

Next, we will introduce how to use the Webman framework for data visualization. First, we need to prepare some data and import relevant libraries. Create a file named visualize.py in your myapp directory and write the following code in the file:

import webman
import matplotlib.pyplot as plt
import numpy as np

# 生成一些示例数据
x = np.linspace(0, 2 * np.pi, 100)
y = np.sin(x)

# 创建一个简单的折线图
plt.plot(x, y)
plt.xlabel('x')
plt.ylabel('y')
plt.title('Sin Wave')

# 将图形保存为图片文件
plt.savefig('static/images/plot.png')

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The above code uses the Matplotlib library to generate a simple line chart and save the result as An image file named plot.png. Note that we save the images in the static/images directory, which is the default static file directory of the Webman framework.

Next, we need to add a corresponding route in the routing module of the web application. Open the myapp/routes.py file and write the following code in the file:

from webman import route

@route('/plot')
def show_plot():
    return {'template': 'plot.html'}

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The above code creates a route named /show_plot. When the route is accessed, a web page containing a line chart will be displayed. .

Finally, we need to load this image in the template file. Create a template file named plot.html and write the following code in the file:

<!DOCTYPE html>
<html>
<head>
    <title>Plot</title>
</head>
<body>
    <img src="{{ url_for('static', filename='images/plot.png') }}" alt="Plot">
</body>
</html>

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The above code uses the template syntax of the Flask framework and loads an image from /static/images/plot.png .

Report generation

In addition to data visualization, we can also use the Webman framework to generate reports. First, we need to install a library called Fpdf, which provides functionality to generate PDF files in Python. Open a terminal and execute the following command to install Fpdf:

pip install fpdf

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After the installation is complete, create a file named report.py in your myapp directory and write the following code in the file:

from fpdf import FPDF

class PDF(FPDF):
    def header(self):
        self.set_font("Arial", "B", 12)
        self.cell(0, 10, "Report", align="C")

    def footer(self):
        self.set_y(-15)
        self.set_font("Arial", "I", 8)
        self.cell(0, 10, "Page %s" % self.page_no(), 0, 0, "C")

    def chapter(self, title, content):
        self.set_font("Arial", "B", 12)
        self.cell(0, 10, title, ln=True)
        self.set_font("Arial", "", 12)
        self.multi_cell(0, 10, content)

# 创建一个PDF文件并生成报表内容
pdf = PDF()
pdf.add_page()
pdf.chapter("Chapter 1", "This is the content of chapter 1.")
pdf.chapter("Chapter 2", "This is the content of chapter 2.")
pdf.output("static/report.pdf")

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The above code defines a class named PDF, which inherits the PDF class of the FPDF library and overrides the header and footer methods. In the chapter method, we can add the content of the report. Finally, we save the report as a PDF file named report.pdf.

Next, we need to add a corresponding route in the routing module of the web application. Open the myapp/routes.py file and write the following code in the file:

from webman import route

@route('/report')
def show_report():
    return {'template': 'report.html'}

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The above code creates a route named /show_report.

Finally, we need to add a link to the template file so that users can download the report file. Open the report.html template file and write the following code in the file:

<!DOCTYPE html>
<html>
<head>
    <title>Report</title>
</head>
<body>
    <a href="{{ url_for('static', filename='report.pdf') }}" download>Download Report</a>
</body>
</html>

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The above code adds a link to the web page pointing to the report file. Users can download the report by clicking on the link.

Run the web application

After completing the above steps, we can use the following command to run the web application:

webman run

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Then in the browser Visit http://localhost:5000/plot and http://localhost:5000/report, and you will see the results of data visualization and report generation.

Summary:

In this article, we introduced how to use the Webman framework to achieve data visualization and report generation functions. By using the Matplotlib library for data visualization and the Fpdf library for report generation, we can easily display and share data in web applications. Hope this article helps you!

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