day14作业
- 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
- 根据1得到的列表,取出薪资最高的人的信息
- 根据1得到的列表,取出最年轻的人的信息
- 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
- 根据1得到的列表,过滤掉名字以a开头的人的信息
file_name = "data.txt"
def extract_data(file_name):
infor_lst = []
keys = ("name", "sex", "age", "salary")
with open(file_name, "r") as f:
for line in f:
values = line.strip().split()
infor_lst.append(dict(zip(keys, values)))
return infor_lst
infor_lst = extract_data(file_name)
print("用户字典列表:")
print(infor_lst)
print("薪资最高:")
print(max(infor_lst, key=lambda user:user["salary"]))
print("最年轻:")
print(min(infor_lst, key=lambda user:user["salary"]))
print("名字首字母大写:")
for user in infor_lst:
user["name"]= user["name"].title()
print(infor_lst)
print("过滤掉名字以a开头的用户:")
infor_lst = extract_data(file_name)
lst = list(filter(lambda user:not user['name'].startswith("a"), infor_lst))
print(lst)
使用递归打印nums斐波那契数列(前两个数的和得到第三个数,如:0 1 1 2 3 5 8...)
print("方法1:生成器")
def feb():
i = 0
i_plus_1 = 1
yield i
yield i_plus_1
while True:
new = i + i_plus_1
yield new
i = i_plus_1
i_plus_1 = new
feb_num = feb()
for i in range(10):
print(next(feb_num))
print("方法2:递归")
def feb(max_num, a=0, b=1):
if a == 0 and b == 1:
print(a)
print(b)
sum_num = a + b
if sum_num > max_num:
return
print(sum_num)
feb(max_num, b, sum_num)
feb(40)
一个嵌套很多层的列表,如l=[1,2,[3,[4,5,6,[7,8,[9,10,[11,12,13,[14,15]]]]]]],用递归取出所有的值
print("打印嵌套列表中的值:")
lst =[1,2,[3,[4,5,6,[7,8,[9,10,[11,12,13,[14,15]]]]]]]
def extract(lst):
for i in lst:
if type(i) == list:
extract(i)
else:
print(i)
extract(lst)
print("保存值到列表")
def extract(lst):
num = []
for i in lst:
if type(i) == list:
num.extend(extract(i))
else:
num.append(i)
return num
nums = extract(lst)
print(nums)