while True :
    print('='*60)
    print('*'*10,'孩子身高预测系统','*'*10)
    # 功能选择
    print('\ty、预测查询')
    print('\tq、退出系统')
    menus_select = input('请选择功能:y,q(y是进行预测查询,q是退出程序) :')
    if menus_select == 'y':
        father_height = float(input('请输入父亲身高:'))
        mother_height = float(input('请输入母亲身高:'))
        children_gender = input('请输入孩子性别M，F（M是男生，F是女生）:')
        sport = input("是否经常运动？y是/n否 ：")
        diet = input("是否饮食规律？y是/n否 ：")
 
        if children_gender == 'M':
            boys_height_min = (father_height + mother_height + 1*13)/2
            if sport == "y":
                boys_height_min=boys_height_min*1.02
            else:
                boys_height_min=boys_height_min
            if diet == "y":
                boys_height_min=boys_height_min*1.015
            else:
                boys_height_min=boys_height_min
            boys_height_result = f'孩子的身高预估在: {round(boys_height_min, 1)}'
            print(boys_height_result)
 
        elif children_gender == 'F':
            girls_height_min = (father_height + mother_height -13)/2
            if sport == "y":
                girls_height_min=girls_height_min*1.02
            else:
                girls_height_min=girls_height_min
            if diet == "y":
                girls_height_min=girls_height_min*1.015
            else:
                girls_height_min=girls_height_min
            girls_height_result = f'孩子的身高预估在: {round(girls_height_min, 1)}cm'
            print(girls_height_result)
        else:
            print('输入有误，请重新输入')            
    elif menus_select == 'q':
        break
    else:
        print('输入有误，请重新输入')
    print('=' * 50)
    print()

抄抄改改还在学习中大家将就看