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# -*- coding: utf-8 -*-
"""
Created on Mon Jan 10 09:38:05 2022
@author: Administrator
"""
import pandas as pd
#从键盘输入一个班级名称
class_name = input ( )
################start###############
#1.从文件‘学生花名册.xls’
df = pd . read_excel ( " 学生花名册.xls " )
#################end################
#基于这个DataFrame对象df完成下面的操作：
################start###############
#2.输出class_name班级前3位同学姓名
df1 = df . groupby ( by = " 班级名称 " ) . get_group ( class_name )
print ( df1 [ " 姓名 " ] . head ( 3 ) )
#################end################
################start###############
#3.统计class_name班级不同性别的学生人数（ ）
print ( df1 . groupby ( by = " 性别 " ) [ " 学号 " ] . count ( ) )
#################end################
