python turtle circle

读取XML

import numpy as np
import pandas as pd
xml = """<?xml version='1.0' encoding='utf-8'?>
<data>
 <row>
    <shape>square</shape>
    <degrees>360</degrees>
    <sides>4.0</sides>
 </row>
 <row>
    <shape>circle</shape>
    <degrees>360</degrees>
    <sides/>
 </row>
 <row>
    <shape>triangle</shape>
    <degrees>180</degrees>
    <sides>3.0</sides>
 </row>
 </data>"""
df = pd.read_xml(xml)
# 此处不一定可以，要看pandas版本号
df
'''
      shape  degrees  sides
0    square      360    4.0
1    circle      360    NaN
2  triangle      180    3.0
'''