python-code-14

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今日作業：
   1、求檔案a.txt中總共包含的字元個數？
   2、思考題  思考為何在第一次之後的n次sum求和得到的結果為0？
      with open(‘a.txt‘,encoding=‘utf-8‘) as f:
         g=(len(line) for line in f)
      print(sum(g))

   3、檔案shopping.txt內容如下
      mac,2000,3
      lenovo,3000,10
      tesla,1000000,10
      chicken,200,1

      求總共花了多少錢？
      列印出所有的商品資訊，格式為
      [{‘name‘:‘xxx‘,‘price‘:‘3333‘,‘count‘:3},....]
      求單價大於10000的商品資訊，格式同上

   4、檔案內容如下,標題為:姓名,性別,年紀,薪資
      egon male 18 3000
      alex male 38 30000
      wupeiqi female 28 20000
      yuanhao female 28 10000

      要求:
      從檔案中取出每一條記錄放入列表中,
      列表的每個元素都是{‘name‘:‘egon‘,‘sex‘:‘male‘,‘age‘:18,‘salary‘:3000}的形式

   5 根據1得到的列表,取出薪資最高的人的資訊
   6 根據1得到的列表,取出最年輕的人的資訊
   7 根據1得到的列表,將每個人的資訊中的名字映射成首字母大寫的形式
   8 根據1得到的列表,過濾掉名字以a開頭的人的資訊

##1sum_file = 0with open(‘a.txt‘,encoding=‘utf-8‘) as f:   for line in f:       sum_file += len(line)print(sum_file)with open(‘a.txt‘,encoding=‘utf-8‘) as f:    g=(len(line) for line in f)    print(sum(g))##2#g是產生器，產生器的取值特性就是從頭到尾取完就結束，sum迭代取值第一次就取完了，所以後面g都是0，即sum也都是0##3total =0with open(‘shopping.txt‘,encoding=‘utf-8‘) as f:    for line in f:        line = line.strip(‘\n‘).split(‘,‘)        price = int(line[1])*int(line[2])        total += priceprint(total)with open(‘shopping.txt‘,encoding=‘utf-8‘) as f:    g = (int(line.strip(‘\n‘).split(‘,‘)[1])*int(line.strip(‘\n‘).split(‘,‘)[2]) for line in f)    print(sum(g))shopping_info = []with open(‘shopping.txt‘,encoding=‘utf-8‘) as f:    for line in f:        line = line.strip(‘\n‘).split(‘,‘)        keys = [‘name‘,‘price‘,‘count‘]        d = {k:v for k,v in zip(keys,line)}        shopping_info.append(d)        print(d)print(shopping_info)shopping_info = []with open(‘shopping.txt‘,encoding=‘utf-8‘) as f:    for line in f:        line = line.strip(‘\n‘).split(‘,‘)        if int(line[1]) > 10000:            keys = [‘name‘,‘price‘,‘count‘]            d = {k:v for k,v in zip(keys,line)}            shopping_info.append(d)print(shopping_info)##4user_info = []with open(‘4.txt‘,encoding=‘utf-8‘) as f:    for line in f:        line = line.split()        keys = [‘name‘,‘sex‘,‘age‘,‘salary‘]        d = {k:v for k,v in zip(keys,line)}        user_info.append(d)print(user_info)##5user_info = []with open(‘4.txt‘,encoding=‘utf-8‘) as f:    for line in f:        line = line.split()        keys = [‘name‘,‘sex‘,‘age‘,‘salary‘]        d = {k:v for k,v in zip(keys,line)}        user_info.append(d)print(user_info)salary_list = [int(index[‘salary‘]) for index in user_info]# for index in user_info:#     salary_list.append(int(index[‘salary‘]))res = max(salary_list)with open(‘4.txt‘,encoding=‘utf-8‘) as f:    for line in f:        if res == int(line.split()[3]):            print(line)##6user_info = []with open(‘4.txt‘,encoding=‘utf-8‘) as f:    for line in f:        line = line.split()        keys = [‘name‘,‘sex‘,‘age‘,‘salary‘]        d = {k:v for k,v in zip(keys,line)}        user_info.append(d)print(user_info)age_info = (int(age[‘age‘]) for age in user_info)# for age in user_info:#     age = int(age[‘age‘])#     age_info.append(age)for info in user_info:    if int(info[‘age‘]) == min(age_info):        print(info)##7user_info = []with open(‘4.txt‘, encoding=‘utf-8‘) as f:    for line in f:        line = line.split()        keys = [‘name‘, ‘sex‘, ‘age‘, ‘salary‘]        d = {k: v for k, v in zip(keys, line)}        user_info.append(d)print(user_info)for name in user_info:    name[‘name‘] = name[‘name‘].capitalize()print(user_info)##8user_info = []with open(‘4.txt‘, encoding=‘utf-8‘) as f:    for line in f:        line = line.split()        keys = [‘name‘, ‘sex‘, ‘age‘, ‘salary‘]        d = {k: v for k, v in zip(keys, line)}        user_info.append(d)print(user_info)new_user_info = [aname for aname in user_info if not aname[‘name‘].startswith(‘a‘)]# new_user_info = []# for aname in user_info:#     if not aname[‘name‘].startswith(‘a‘):#         new_user_info.append(aname)print(new_user_info)

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python-code-14