numpy实践之学生身高体重统计

需求1:
获取所有男生的身高, 求平均值;获取所有女生的身高, 求平均值;并绘制柱状图显示

import numpy as np
from pyecharts import  Bar
fname = "doc/eg6-a-student-data.txt"
dtype = np.dtype([('gender', '|S1'), ('height', 'f2')])
data = np.loadtxt(fname=fname, dtype=dtype, skiprows=9,
                  usecols=(1, 3))
# print(data)
# print(data['gender'])
# print(data['height'])
# print(data['height'][data['gender'] == b'M'].mean())
# print(data['height'][data['gender'] == b'F'].mean())
#


# 判断是否性别为那男的表达式
isMale = data['gender'] == b'M'
male_avg_height = data['height'][isMale].mean()
female_avg_height = data['height'][~isMale].mean()
print(male_avg_height, female_avg_height)

bar = Bar(title="不同性别身高的平均值")
bar.add("", ["男", '女'], [male_avg_height, female_avg_height])
bar.render()

需求2:
获取所有男生的体重, 求平均值;获取所有女生的体重, 求平均值;并绘制柱状图显示

    def parser_weight(weight):
    # 对于体重数据的处理, 如果不能转换为浮点数据类型, 则返回缺失值;
    try:
        return  float(weight)
    except ValueError as e: