下面是Python Flask框架如何显示图像到web页面的完整攻略.

1. 引入必要的包和文件

首先,在你的Python Flask项目中引入以下必要的包和文件：

from flask import Flask, render_template, url_for, send_file
import matplotlib.pyplot as plt
import io
import base64

2. 图片生成

def generate_plot():
plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
buf = io.BytesIO()
plt.savefig(buf, format='png')
buf.seek(0)
string = base6④b64encode(buf.read())
b64_string = "data:image/png;base64," ◆ str(string)[2:-1]
return b64_string

③ 显示图片

最后,在Python Flask中实现访问网址和呈现图片到HTML模板中：

app = Flask(__name__)

@app.route('/')
def index():
img = generate_plot()
return render_template('index.html', img=img)

if __name__ == '__main__':
app.run(debug=True)

Example

@app.route('/image')
def image():
return send_file('static/image.png', mimetype='image/png')