1.已知一个列表，求列表中心元素。
答案：
# author_lorry
# date: 2018/11/12
import random
import string
n = input("你想看奇数还是偶数：？输入奇数or偶数")
if n == "奇数":
flag = True
while flag:
a = random.randint(1,10)
if a % 2 ==0:
flag = False
if n == "偶数":
flag = True
while flag:
a = random.randint(1,10)
if a % 2 !=0:
flag = False
i = 1 #此处用来生成随机数字和字母，然后添加在列表中
list1 = []
list1_middle =[ ]
while i <a:
str1 = string.ascii_letters
str11 = random.choice(str1)
list1.append(str11)
num = random.randint(1,20)
list1.append(num)
num1 = random.randint(1,20)
list1.append(num1)
i += 1
print(list1)
list1_len = len(list1)
if list1_len % 2 == 0:
middle_item1 = list1[int(list1_len/2-1)]
list1_middle.append(middle_item1)
middle_item2 = list1[int(list1_len/2)]
list1_middle.append(middle_item2)
if list1_len % 2 != 0:
middle_item1 = list1[int(list1_len//2)]
list1_middle.append(middle_item1)
print(list1_middle)
2.已知一个列表，求所有元素和。
答案：
# author_lorry
# date: 2018/11/12
import random
n = int(input("列表中几个数字求和？"))
m = int(input("几位数求和？"))
num1 = []
for i in range(n):
num = random.randint((10**(m-1)),1*(10**m)-1)
num1.append(num)
print(num1)
sum_num1 = sum(num1)
print(sum_num1)
3.已知一个列表，输出所有奇数下标元素。
答案：
# author_lorry
# date: 2018/11/12
import random
import string
i = 1
list1 = []
list1_jishu =[]
while i <5: #此处用来生成随机数字和字母，然后添加在列表中
str1 = string.ascii_letters
str11 = random.choice(str1)
list1.append(str11)
num = random.randint(1,20)
list1.append(num)
i += 1
print(list1)
len_list1 = len(list1)
for index in range(1,len_list1,2):
jishu_yuansu = list1[index]
list1_jishu.append(jishu_yuansu)
print(list1_jishu)
4.已知一个列表，输出所有元素中，值为奇数的。
答案：
# author_lorry
# date: 2018/11/12
import random
import string
list1 = []
jishu_value =[ ]
oushu_value = []
i = 0
while i <=10:
num = random.randint(1,20)
list1.append(num)
str1 = string.ascii_letters
str11 = random.choice(str1)
list1.append(str11)
num1 = random.randint(1,20)
list1.append(num1)
i += 1
print("生成的随机列表为：",list1)
print()
for item in list1:
if str(item).isdigit():
num_item = int(item)
if num_item %2 !=0:
jishu_value.append(num_item)
else:
oushu_value.append(num_item)
else:
print("%s"%item,end=" ")
print("不是数字")
print()
print(oushu_value,"是偶数")
print(jishu_value,"是奇数")
5.已知一个列表，将所有元素乘二。
答案：
若是将元素来两遍
# author_lorry
# date: 2018/11/12
import random
import string
list1 = []
i = 0
while i <=3:
num = random.randint(1,20)
list1.append(num)
str1 = string.ascii_letters
str11 = random.choice(str1)
list1.append(str11)
num1 = random.randint(1,20)
list1.append(num1)
i += 1
print("生成的随机列表为：",list1)
list2 = list1*2
print(list2)
若是列表中数值元素2倍的形式。
# author_lorry
# date: 2018/11/12
#若是列表中数值元素2倍的形式。
import random
import string
list1 = []
list2 =[ ]
i = 0
while i <=3:
num = random.randint(1,20)
list1.append(num)
num1 = random.randint(1,20)
list1.append(num1)
i += 1
print("生成的随机列表为：",list1)
#5.已知一个列表，将所有元素乘二。
for item in list1:
new_item = item*2
list2.append(new_item)
print(list2)
6.有一个长度是10的列表，数组内有10个人名，要求去掉重复的
答案：
1.使用循环进行去重
names = ["lorry","lorrybz","lorry123","lorry","小明","小明","小红","小明","狗蛋","二狗子",]
index = 0
while index < len(names):
i = 1
while index+i < len(names):
if names[index] ==names[index+i]:
names.remove(names[index+i])
print(names)
i+=1
index +=1
print()
print("去重后的名字为",names)
1.使用集合快速去重
names = ["lorry","lorrybz","lorry123","lorry","小明","小明","小红","小明","狗蛋","二狗子",]
names1 = set(names)
print(names1)
例如:names = ['张三', '李四', '大黄', '张三'] -> names = ['张三', '李四', '大黄']
7.已经一个数字列表(数字大小在0~6535之间), 将列表转换成数字对应的字符列表
例如: list1 = [97, 98, 99] -> list1 = ['a', 'b', 'c']
答案：
# author_lorry
#list1 = [97, 98, 99] -> list1 = ['a', 'b', 'c']
import random
i = 0
list1 = []
list2 = []
while i <= 10:
num = random.randint(0,6535)
list1.append(num)
i += 1
print(list1)
i = 0
while i < len(list1):
item = int(list1[i])
chr_item = chr(item)
list2.append(str(chr_item))
i +=1
print(list2)
二、
# author_lorry
num = []
list = []
for i in range(6536):
new = chr(i)
list.append(str(new))
print(list)
# author_lorry
import random
i = 0
list1 = []
list2 = []
while i <= 10:
num = random.randint(0,6535)
list1.append(num)
i += 1
print(list1)
for item in list1:
chr_item = chr(item)
list2.append(str(chr_item))
print(list2)
8.用一个列表来保存一个节目的所有分数，求平均分数(去掉一个最高分，去掉一个最低分，求最后得分)
答案：
# author_lorry
import random
scores = []
n = int(input("几个评委随机打分：？"))
new_scores = []
for _ in range(n):
score = random.randint(700,1000)
scores.append(score)
scores.sort()
print(scores)
aa = scores.index(max(scores))
bb = scores.index(min(scores))
a = scores.pop(aa)
b = scores.pop(bb)
new_scores = scores
len_new_scores = len(new_scores)
average_new_scores = sum(new_scores)/len_new_scores
print("%d个评委打分，在去掉最高分%d，最低分%d后，平均得分为%s"%(n,a,b,average_new_scores))
9.有另个列表A和B，使用列表C来获取两个列表中公共的元素
答案：
例如: A = [1, 'a', 4, 90] B = ['a', 8, 'j', 1] --> C = [1, 'a']
答案：
# author_lorry
import random
import string
list1 = []
for i in range(10):
str1 = string.ascii_letters
str11 = random.choice(str1)
list1.append(str11)
num = random.randint(1,20)
list1.append(num)
num1 = random.randint(1,20)
list1.append(num1)
i += 1
list2 = []
for i in range(10):
str1 = string.ascii_letters
str11 = random.choice(str1)
list2.append(str11)
num = random.randint(1,20)
list2.append(num)
num1 = random.randint(1,20)
list2.append(num1)
i += 1
print(list1) #生成随机含有字母和数字的列表
print(list2)
public_yuansu = []
for item in list1:
index = 0
while index <= len(list2)-1:
if item == list2[index]:
public_yuansu.append(item)
index += 1
public_yuansu=list(set(public_yuansu)) # 因为随机列表的生成可能有重复，因此对公共元素的列表进行去重
print(public_yuansu)
使用 in进行查找。
import random
import string
list1 = []
for i in range(10):
str1 = string.ascii_letters
str11 = random.choice(str1)
list1.append(str11)
num = random.randint(1,20)
list1.append(num)
num1 = random.randint(1,20)
list1.append(num1)
i += 1
list2 = []
for i in range(10):
str1 = string.ascii_letters
str11 = random.choice(str1)
list2.append(str11)
num = random.randint(1,20)
list2.append(num)
num1 = random.randint(1,20)
list2.append(num1)
i += 1
print(list1)
print(list2) #生成随机含有字母和数字的列表
public_yuansu = []
for item in list1:
if item in list2:
public_yuansu.append(item)
print(public_yuansu) #打印出两个列表的公共元素
index = 0 # 因为随机列表的生成可能有重复，因此对公共元素的列表进行去重
while index < len(public_yuansu):
i = 1
while index +i < len(public_yuansu):
if public_yuansu[index] == public_yuansu[index+i]:
public_yuansu.remove(public_yuansu[index+i])
i +=1
index += 1
print(public_yuansu)
