1.求s=a+aa+aaa+aaaa的值，例2+22+222+2222
size = int(input('enter the list\'size:')) //确定列表的长度
number1 = int(input('enter the number1:')) //确定列表元素的基数
list1 = [] //创建空列表1，用于存放给定的长度加基数的元素
list2 = [] //空列表2，用于实现列表元素相加的字符串输出
for x in range(1,size+1):
list1.append(str(number1)*x)
print(list1) //向列表1添加给定的大小与基数，字符串添加
str1 =''
sum1 = 0 //定义和的初值
for y in list1:
sum1+=int(y) //求列表元素的和，先转换为int型
list2.append(y)//向列表2添加列表1的元素
list2.append('+')//添加运算符
list2.pop()//去掉最后位的+号
for z in list2:
str1+=str(z)//以字符单个取出列表2元素相加
print('%s = %d'%(str1,sum1))
enter the list'size:5
enter the number1:2
['2', '22', '222', '2222', '22222']
2+22+222+2222+22222 = 24690
2.打印直角三角形
number1 = int(input('enter the number1:'))
for x in range(1,number1+1):
for y in range(1,x+1):
print('*',end='')
print()
enter the number1:5
*
**
***
****
*****
3.打印等腰三角形
number1 = int(input('enter the number1:'))
for x in range(1,number1+1):
for y in range(number1,x,-1):
print(' ',end='')
for z in range(1,2*x):
print('*',end='')
print()
enter the number1:5
*
***
*****
*******
*********
4.打印倒直角三角形
number1 = int(input('enter the number1:'))
for x in range(1,number1+1):
for y in range(number1,x-1,-1):
print('*',end='')
print()
enter the number1:5
*****
****
***
**
*
5.输入两个正整数m,n求最大公约数和最小公倍数
6.一个数若刚好等于它的因子之和，如6=1+2+3，则它是完美数，求1000以内所有的完美数。
7.输出九九乘法表
for x in range(1,10):
for y in range(1,x+1):
print('%d*%d=%d'%(x,y,x*y),end=' ',sep='\t')
print()
1*1=1
2*1=2 2*2=4
3*1=3 3*2=6 3*3=9
4*1=4 4*2=8 4*3=12 4*4=16
5*1=5 5*2=10 5*3=15 5*4=20 5*5=25
6*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36
7*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49
8*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64
9*1=9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81
8.一个五位数判断它是不是回文数字，12321
number = int(input('enter the number:'))
str1 = str(number)
str2 = str1[::-1]
if number<10000 or number>99999:
print('input error!')
elif number == int(str2):
print('yes!')
else:
print('no')
enter the number:12321
yes!
9.打印菱形
for x in range(1,5):
for y in range(5,x+1,-1):
print(' ',end='')
for z in range(1,2*x):
print('*',end='')
print()
for x in range(1,4):
for a in range(1,x+1):
print(' ',end='')
for b in range(1,2*(4-x)):
print('*',end='')
print()
*
***
*****
*******
*****
***
*
[Finished in 0.2s]
10.输入一个字符串，判断有几个空格，几个数字，几个英文字母，几个其他字符。
str1 = input('enter the str:')
index1 = str1.count(' ',0,len(str1))
count1 = 0
count2 = 0
count3 = 0
for x in range(0,len(str1)):
str2 = str1[x]
if str2.isdigit()==True:
count1+=1
elif str2.isalpha()==True:
count2+=1
else:
count3 = len(str1) - index1 - count1 - count2
print('该字符串有%d个数字，%d个字母，%d个其他字符,%d个空格'%(count1,count2,count3,index1))
enter the str:1 2 abd__*&
该字符串有2个数字，3个字母，4个其他字符,2个空格
11.已知一个列表，求中心元素
n = int(input('enter the number\'s size:'))
numbers = []
for x in range(0,n):
data = input('enter the numbers\'s data:')
numbers.append(data)
print(numbers)
if len(numbers)%2!=0:
index1 = len(numbers)//2
print('中心元素:%s'%numbers[index1])
else:
index2 = len(numbers)//2
print('中心元素:%s,%s'%(numbers[index2-1],numbers[index2]))
enter the number's size:5
enter the numbers's data:1
enter the numbers's data:2
enter the numbers's data:3
enter the numbers's data:4
enter the numbers's data:5
['1', '2', '3', '4', '5']
中心元素:3
12.已知一个列表求所有元素和
n = int(input('input the size:'))
numbers = []
sum1 = 0
for x in range(0,n):
str1 = input('input the data:')
numbers.append(str1)
sum1+=int(numbers[x])
print(numbers)
print(sum1)
input the size:5
input the data:2
input the data:3
input the data:4
input the data:5
input the data:6
['2', '3', '4', '5', '6']
20
13.已知一个列表，输出奇数下标元素
numbers = [1,2,3,4,5,6,7,8]
print('偶数',numbers[0:len(numbers):2])
print('奇数',numbers[1:len(numbers):2])
偶数 [1, 3, 5, 7]
奇数 [2, 4, 6, 8]
[Finished in 0.2s]
14.已知一个列表输出列表中值为奇数的
numbers = [2,434,67,24,658,32,37,347]
for x in numbers:
if int(x%)2!=0:
print(x)
67
37
347
[Finished in 0.3s]
15.已知列表，所有元素*2
numbers = [2,435,5,7,8,9,322]
numbers1 = []
for x in numbers:
numbers1.append(int(x)*2)
print(numbers1)
[4, 870, 10, 14, 16, 18, 644]
[Finished in 0.2s]
16.已知一个列表将所有元素加到第一个元素的位置
17.已知一个列表，将奇数位元素与偶数位元素分开保存到2个新列表中。
number1 = [1,2,3,4,5,6]
number2 = []
number3 = []
for x in range(0,len(number1)):
if x%2!=0:
number2.append(number1[x])
elif x%2==0:
number3.append(number1[x])
print('奇数',number2)
print('偶数',number3)
奇数 [2, 4, 6]
偶数 [1, 3, 5]
[Finished in 1.7s]
18.把A列表前5个元复制到B列表中
numbers = [1,2,3,4,5,6,7]
number1 = []
number2 = []
for x in range(0,5):
number1.append(numbers[x])
number2 = numbers[0:5].copy()
print(number2)
print(number1)
[1, 2, 3, 4, 5]
[1, 2, 3, 4, 5]
[Finished in 1.5s]
19.把1-36分别放入列表中，计算列表对角线元素之和 6*6列表。
20.列表排序
numbers = []
for _ in range(10):
number = int(input('input number:'))
numbers.append(number)
numbers.sort()
print(numbers)
input number:1
input number:3
input number:2
input number:5
input number:4
input number:6
input number:9
input number:8
input number:10
input number:7
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
21.删除列表中某个元素
numbers = [1,2,3,4,5,6,7,8,9,0]
numbers.pop(2)
print(numbers)
[1, 2, 4, 5, 6, 7, 8, 9, 0]
[Finished in 0.4s]
22.列表长度为10 ，递增排列，插入一个数，按递增排。
numbers = [0,2,4,6,8,10,12,14,16,18]
numbers.append(int(3))
numbers.sort()
print(numbers)
[0, 2, 3, 4, 6, 8, 10, 12, 14, 16, 18]
[Finished in 0.2s]
numbers = [1,22,3,52,4,5,445,63,48,60]
for x in range(0,len(numbers)):
for y in range(0,len(numbers)-x-1):
if numbers[y]23.列表为10，去重
numbers = [1,2,3,3,4,2,3,2,5,6,1]
new_ids = []
for id in numbers:
if id not in new_ids:
new_ids.append(id)
print(new_ids)
[1, 2, 3, 4, 5, 6]
24.删除列表中下标3-6的元素
numbers = [1,2,3,3,4,2,3,2,5,6,1]
del numbers[3:6]
print(numbers)
[1, 2, 3, 3, 2, 5, 6, 1]
25.已知列表a,b 定义c,c包含a,b 去重
a = [1,2,4,6,7]
b = [2,3,4,5,6,9]
c = []
for x in range(0,len(a)):
if a[x] not in c:
c.append(a[x])
for y in range(0,len(b)):
if b[y] not in c:
c.append(b[y])
print(c)
[1, 2, 4, 6, 7, 3, 5, 9]
学生管理系统
'''
系统对应的大的容器是字典--->字典中的某一个key对应的值是所有的学生
每个学生是一个字典{'student':[{学生1},{学生2},{学生3}]}
'''
# system_info={'student':[{key_name:value,key_id:value,key_tel:value,key_age:value},{},{}]}
key_all_student = 'students'
system_info = {}
key_name = 'name'
key_age = 'age'
key_tel = 'tel'
key_id = 'id'
# number表示有几个学生用来随机生成学生学号
number = 0
while True:
print('='*30)
print('欢迎进入学生管理系统')
print('1.添加学生\n2.查看学生信息\n3.删除学生\n4.修改学生信息\n0.退出')
print('='*30)
choose = input('选择操作！:')
if choose=='0':
break
if choose=='1':
while True:
print('==添加学生==')
add_name = input('姓名')
add_age = input('年龄')
add_tel = input('电话')
# 产生学号
number+=1
add_id = 'cd1805'+str(number).rjust(3,'0')
# 创建学生(一个学生就是一个字典)
add_student = {key_name:add_name,key_age:add_age,key_tel:add_tel,key_id:add_id}
# 获取存学生的容器
all_student=system_info.get(key_all_student)
# 判断system_info容器是否为空，为二次添加判断
if all_student == None:
all_student = []
all_student.append(add_student)
system_info[key_all_student]=all_student
print('添加学生%s成功'%add_name)
# 给出选择
print(system_info)
print('1.继续添加')
print('2.返回上一级')
choose1 = int(input('选择操作'))
if choose1!=1 or choose1==2:
break
continue
if choose=='2':
while True:
print('查看学生\n1.按姓名查找\n2.查找所有信息\n3.根据学号查看\n4.返回上一层')
choose2 = input('选择操作')
flag =False
# flag表示是否找不到学生
if choose2=='1':
name = input('请输入姓名')
for student in all_student:
if name==student[key_name]:
print(student)
flag = True
if flag==False:
print('没找到学生信息!')
# 如果学生名字和输入名字相同，打印学生信息
if choose2=='2':
# print(system_info)
all_student=system_info.get(key_all_student)
# 系统还没有添加学生
# or和and的短路操作：
# 表达式1 or表达式2：如果表达式1位True，那么不会执行2，结果为True
# 表达式1 and 表达式2：表达式1值为False，不会执行表达式2，结果为False
if (not all_student) or (not len(all_student)):
print('系统中没有学生')
break
#有学生时
for student in all_student:
print('姓名:%s,年龄:%s,学号:%s,电话:%s'%\
(student[key_name],student[key_age],student[key_id],student[key_tel]))
if choose2=='3':
idnum = input('请输入学号')
flag = False
for student in all_student:
if idnum==student[key_id]:
print(student)
flag=True
if flag==False:
print('没有找到学生信息')
if choose2=='4':
print('返回上一层')
break
if choose=='3':
while True:
print('删除学生\n1.根据姓名删除\n2.根据学号删除\n3.返回上级')
choose3 = input('选择操作')
all_student = system_info.get(key_all_student)
if (not all_student) or (not len(all_student)):
print('该系统没有学生')
break
if choose3=='1':
name = input('输入要删除的学生姓名')
flag = False
list1 = []
for student in all_student:
if name==student[key_name]:
list1.append(student)
# 学生可能存在重名，所以需要把满足条件的姓名取出来，单独存放，再继续判断
if not len(list1):
print('没有找到相关学生')
continue
# 打印所有需要删除的学生
index1 = 0
for student in list1:
print(index1,student)
index1+=1
index2 = int(input('请选择要删除的学生的标号0-%d'%\
(len(list1)-1)))
del_student = list1[index2]
# 从系统中删除学生
system_info[key_all_student].remove(del_student)
if choose3=='2':
idnum = input('输入你要删除的学生学号')
all_student = system_info.get(key_all_student)
if (not all_student) or (not len(all_student)):
print('该系统没有学生')
break
for x in all_student[:]:
if idnum==x[key_id]:
system_info[key_all_student].remove(x)
print(system_info)
if choose3=='3':
break
if choose=='4':
while True:
print('修改学生信息\n1.按姓名修改\n2.按学号修改\n3.返回上一级')
all_student = system_info.get(key_all_student)
if (not all_student) or (not len(all_student)):
print('该系统没有学生')
break
choose4 = input('选择操作:')
if choose4=='1':
name = input('输入你要修改的学生姓名:')
flag = False
list1 = []
for student in all_student:
if name == student[key_name]:
list1.append(student)
index1 = 0
for student in list1:
print(index1, student)
index1 += 1
index2 = int(input('请选择要修改的学生的标号0-%d' % \
(len(list1) - 1)))
update_student = list1[index2]
suoyin1 = system_info[key_all_student].index(update_student)
while True:
print('选择你要修改哪些学生信息：\n1.姓名\n2.年龄\n3.电话\n4.学号\n5.返回上级')
choose5 = input('选择操作')
if choose5=='1':
system_info[key_all_student][suoyin1][key_name]=input('修改的姓名:')
if choose5=='2':
system_info[key_all_student][suoyin1][key_age] = input('修改的年龄:')
if choose5=='3':
system_info[key_all_student][suoyin1][key_tel] = input('修改的电话:')
if choose5=='4':
system_info[key_all_student][suoyin1][key_id] = input('修改的学号:')
if choose5=='5':
break
if choose4=='2':
numid = input('输入你要修改的学生学号:')
for x in all_student:
if numid==x[key_id]:
suoyin2 = system_info[key_all_student].index(x)
while True:
print('选择你要修改哪些学生信息：\n1.姓名\n2.年龄\n3.电话\n4.学号\n5.返回上级')
choose5 = input('选择操作')
if choose5 == '1':
system_info[key_all_student][suoyin2][key_name] = input('修改的姓名:')
if choose5 == '2':
system_info[key_all_student][suoyin2][key_age] = input('修改的年龄:')
if choose5 == '3':
system_info[key_all_student][suoyin2][key_tel] = input('修改的电话:')
if choose5 == '4':
system_info[key_all_student][suoyin2][key_id] = input('修改的学号:')
if choose5 == '5':
break
if choose4=='3':
break