员工信息表

dic = {'name': 1,'id':0,'age':2,'phone':3,'job':4}
# 读取文件 —— 将文件中的内容整理到内存里
def get_line(filename):
    '''
    读取文件中的每一行
    :param filename:文件名
    :return:生成器，文件中每一行的生成器
    '''
    with open(filename,encoding='utf-8') as f:
        for line in f:
            line = line.strip()
            line_lst = line.split(',')
            yield line_lst

def condition_filter(condition):
    '''
    根据条件_筛选
    :param condition:用户输入的条件'age'>20
    :return:符合条件的行列表
    '''
    condition = condition.strip()
    if '>' in condition:
        col,val = condition.split('>')
        g = get_line('userinfo')
        for line_lst in g:
            if int(line_lst[dic[col]]) > int(val):
                yield line_lst

def views(view_lst,staff_g):     #view_lst = ['name','age']
    '''
    展示符合条件的员工信息
    :param view_lst:['name','age']
    :param staff_g:符合条件的员工信息生成器
    :return:None
    '''
    if '*' in view_lst:
        view_lst = dic.keys()
    for staff_info in staff_g:   #staff_info = [1,Alex,22,13651054608,IT]
        for i in  view_lst:
            print(staff_info[dic[i]],end=' ')
        print('')



# 接收用户的信息 —— 分析信息
# ret = input('>>> ')
ret = 'select name,age where age>22'
view,condition = ret.split('where')   #根据where切割用户输入得到'select name,age ',' age>22'
view = view.replace('select','').strip() #select name,age '去掉select和空格
view_lst = view.split(',')    #'name,age'切割成列表[name,age]
print(view_lst,condition)
g = condition_filter(condition) #调用筛选条件函数，找到符合用户输入条件的行（生成器）
views(view_lst,g)  #展示符合条件的数据