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Web.py
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Web.py
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from flask import Flask
app = Flask(__name__)
@app.route("/graph")
def graph():
import matplotlib
matplotlib.use('Agg') # 不出现画图的框
import matplotlib.pyplot as plt
from io import BytesIO
import base64
# 这段正常画图
plt.axis([0, 5, 0, 20]) # [xmin,xmax,ymin,ymax]对应轴的范围
plt.title('My first plot') # 图名
plt.plot([1, 2, 3, 4], [1, 4, 9, 16], 'ro') # 图上的点,最后一个参数为显示的模式
# -----------
# 转成图片的步骤
sio = BytesIO()
plt.savefig(sio, format='png')
data = base64.encodebytes(sio.getvalue()).decode()
print(data)
html = '''
<html>
<body>
<img src="data:image/png;base64,{}" />
</body>
<html>
'''
plt.close()
# 记得关闭，不然画出来的图是重复的
return html.format(data)
#format的作用是将data填入{}
if __name__ == '__main__':
app.run()