question1. 写一个匿名函数，判断指定的年是否是闰年
year = lambda x: '是闰年' if (x % 4 == 0 and x % 100 != 0) or x % 400 == 0 else '不是闰年'
print(year(1900))
print(year(1992))
print(year(2000))
"""
不是闰年
是闰年
是闰年
"""
question2. 写一个函数将一个指定的列表中的元素逆序( 如[1, 2, 3] -> [3, 2, 1])(注意:不要使用列表自带的逆序函数)
def lis_to_reverse(lis1: list):
y = -1
lis2 = []
for x in range(len(lis1)):
lis2.append(lis1[y])
y -= 1
return lis2
print(lis_to_reverse([1, 2, 3, 4, 'b', 'd', 'asd']))
"""
['asd', 'd', 'b', 4, 3, 2, 1]
"""
question3. 写一个函数，获取指定列表中指定元素的下标(如果指定元素有多个，将每个元素的下标都返回)
例如: 列表是：[1, 3, 4, 1] ,元素是1, 返回:0,3
def lis_to_index(lis1: list, num1: int):
lis2 = []
for index in range(len(lis1)):
if lis1[index] == num1:
lis2.append(index)
return lis2
print(lis_to_index([1, 3, 4, 1], 1))
"""
[0, 3]
"""
question4. 写一个函数，能够将一个字典中的键值对添加到另外一个字典中(不使用字典自带的update方法)
def dic_to_dic(dict1={}, dict2={}):
for key in dict2:
if key not in dict1:
dict1[key] = dict2[key]
else:
continue
return dict1
a = {'a': 1, 'b': 2, 'c': 3}
b = {'a': 1, 'b': 2, 'd': 3}
print(dic_to_dic(a, b))
"""
{'a': 1, 'b': 2, 'c': 3, 'd': 3}
"""
qusetion5. 写一个函数，能够将指定字符串中的所有的小写字母转换成大写字母；所有的大写字母转换成小写字母(不能使用字符串相关方法)
def change_case(str1: str):
str2 = ''
for value in str1[:]:
if 'a' <= value <= 'z':
str2 += chr(ord(value) - 32)
elif 'A' <= value <= 'Z':
str2 += chr(ord(value) + 32)
else:
str2 += value
return str2
print(change_case('abc123DEF'))
"""
ABC123def
"""
question6. 实现一个属于自己的items方法，可以将自定的字典转换成列表。列表中的元素是小的列表，里面是key和value(不能使用字典的items方法)
例如:{'a':1, 'b':2} 转换成 [['a', 1], ['b', 2]]
def dic_to_list(dicts={}):
list1 = []
for key in dicts:
list1.append([key, dicts[key]])
return list1
a = {'a': 1, 'b': 2, 'c': 3}
b = dic_to_list(a)
print(b)
"""
[['a', 1], ['b', 2], ['c', 3]]
"""
question7. 写一个函数，实现学生的添加功能:
# 学生信息函数
def student_information():
print('=============================')
print('\t💣💣欢迎XXX💣💣')
print('')
print('\t🏀1. 添加学生')
print('\t⚽️2. 查看学生')
print('\t🏐️3. 修改学生信息')
print('\t🏓️4. 删除学生')
print('\t🏸️5. 返回')
print('=============================')
return input('请选择(1-5):')
# 添加学生函数
def add_student():
global num_id
while True:
stu_num = 'python1902' + str(num_id).zfill(4)
num_id += 1
stu_id = stu_num
name = input('请输入学生姓名:')
age = int(input('请输入学生年龄:'))
grade = int(input('请输入学生成绩:'))
cellphone = input('请输入学生电话:')
dic_of_stu_message[stu_num] = {'stu_id': stu_id,
'name': name,
'age': age,
'grade': grade,
'cellphone': cellphone
}
print('学生学号为:%s\t姓名:%s\t年龄:%d\t成绩:%d\t电话:%s' % (dic_of_stu_message[stu_num]['stu_id'],
dic_of_stu_message[stu_num]['name'],
dic_of_stu_message[stu_num]['age'],
dic_of_stu_message[stu_num]['grade'],
dic_of_stu_message[stu_num]['cellphone'])
)
print('添加成功！')
choice = input('是否继续添加学生信息(yes/no):')
if choice.lower() == 'no':
break
# 删除学生函数-学号
def delete_stu_id():
temp_stu_id = input('请输入需要删除的学生学号:')
print('删除学生学号为:%s\t姓名:%s\t年龄:%d\t成绩:%d\t电话:%s' % (dic_of_stu_message[temp_stu_id]['stu_id'],
dic_of_stu_message[temp_stu_id]['name'],
dic_of_stu_message[temp_stu_id]['age'],
dic_of_stu_message[temp_stu_id]['grade'],
dic_of_stu_message[temp_stu_id]['cellphone'])
)
temp = input('确认删除?(yes/no):')
if temp == 'yes':
del dic_of_stu_message[temp_stu_id]
print('删除成功')
# 查询学生函数
def check_student():
print('=============================')
print('\t1.查看所有学生')
print('\t2.按姓名查找')
print('\t3.按学号查找')
print('\t4.返回')
return input('请选择(1-4):')
# 打印所有学生
def print_all_student():
for index in dic_of_stu_message:
print('学生学号为:%s\t姓名:%s\t年龄:%d\t成绩:%d\t电话:%s' % (dic_of_stu_message[index]['stu_id'],
dic_of_stu_message[index]['name'],
dic_of_stu_message[index]['age'],
dic_of_stu_message[index]['grade'],
dic_of_stu_message[index]['cellphone'])
)
# 冒泡排序(列表中字典-按成绩排序)
def bubble_sort(lis):
length = len(lis)
for i in range(1, length):
for j in range(0, length-1):
if lis[j]['grade'] < lis[j+1]['grade']:
lis[j], lis[j+1] = lis[j+1], lis[j]
return lis
# 读入以储存学生信息
dic_of_stu_message = {}
filename = 'student_information.txt'
list_of_test1 = []
with open(filename, 'r') as file_object:
line = (x for x in file_object)
num_id = 1
while True:
stu_num = 'python1902' + str(num_id).zfill(4)
num_id += 1
try:
dic_of_stu_message[stu_num] = {'stu_id': next(line).rstrip(),
'name': next(line).rstrip(),
'age': int(next(line).rstrip()),
'grade': int(next(line).rstrip()),
'cellphone': next(line).rstrip()
}
except StopIteration:
break
print(dic_of_stu_message)
file_object.close()
# 主程序
num_id = len(dic_of_stu_message) + 1
print(num_id)
while True:
temp1 = student_information()
if temp1 == '1':
add_student()
continue
elif temp1 == '2':
temp2 = check_student()
if temp2 == '1':
print_all_student()
elif temp2 == '4':
continue
elif temp1 == '4':
delete_stu_id()
elif temp1 == '5':
break
# 主程序执行完成后存储学生信息
with open(filename, 'w') as file_object:
for key1 in dic_of_stu_message:
for key2 in dic_of_stu_message[key1]:
file_object.write(str(dic_of_stu_message[key1][key2])+'\n')
file_object.close()
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