标签：ppi sed 文件 ... not lenovo xxx 思考 开头
今日作业：
1、求文件a.txt中总共包含的字符个数？
2、思考题 思考为何在第一次之后的n次sum求和得到的结果为0？
with open(‘a.txt‘,encoding=‘utf-8‘) as f:
g=(len(line) for line in f)
print(sum(g))
3、文件shopping.txt内容如下
mac,2000,3
lenovo,3000,10
tesla,1000000,10
chicken,200,1
求总共花了多少钱？
打印出所有的商品信息，格式为
[{‘name‘:‘xxx‘,‘price‘:‘3333‘,‘count‘:3},....]
求单价大于10000的商品信息，格式同上
4、文件内容如下,标题为:姓名,性别,年纪,薪资
egon male 18 3000
alex male 38 30000
wupeiqi female 28 20000
yuanhao female 28 10000
要求:
从文件中取出每一条记录放入列表中,
列表的每个元素都是{‘name‘:‘egon‘,‘sex‘:‘male‘,‘age‘:18,‘salary‘:3000}的形式
5 根据1得到的列表,取出薪资最高的人的信息
6 根据1得到的列表,取出最年轻的人的信息
7 根据1得到的列表,将每个人的信息中的名字映射成首字母大写的形式
8 根据1得到的列表,过滤掉名字以a开头的人的信息
##1 sum_file = 0 with 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是生成器，生成器的取值特性就是从头到尾取完就结束，sum迭代取值第一次就取完了，所以后面g都是0，即sum也都是0 ##3 total =0 with 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 += price print(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) ##4 user_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) ##5 user_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) ##6 user_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) ##7 user_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) ##8 user_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)
标签：ppi sed 文件 ... not lenovo xxx 思考 开头
原文地址：https://www.cnblogs.com/xujinjin18/p/9181275.html
