day7-列表作业2

1. 创建一个列表，列表中有10个数字, 保证列表中元素的顺序，对列表进行排重,并对列表使用进行降序排序

例如：[70, 88, 91, 70, 107, 234, 91, 177, 282, 197]
		--- 去重之后 [70, 88, 91, 107, 234, 177, 282, 197]
  	---- 降序排序 [282, 234, 197, 177, 107, 91, 88, 70]

list1 = [70, 88, 91, 70, 107, 234, 91, 177, 282, 197]
list2 = []
for x in list1:
    if x in list2:
        continue
    else:
        list2.append(x)
list2.sort(reverse=True)
print(list2)

2. 利用列表推导式, 完成以下需求

a. 生成一个存放1-100中各位数为3的数据列表

结果为 [3, 13, 23, 33, 43, 53, 63, 73, 83, 93]

result = [x for x in range(1,101) if x % 10 == 3]
print(result)

b. 利用列表推到是将 列表中的整数提取出来

例如：[True, 17, "hello", "bye", 98, 34, 21] --- [17, 98, 34, 21]

result = [True, 17, "hello", "bye", 98, 34, 21]
num = [x for x in result if type(x) == int ]
print(num)

c.利用列表推导式 存放指定列表中字符串的长度

例如： ["good", "nice", "see you", "bye"] --- [4, 4, 7, 3]

result = ["good", "nice", "see you", "bye"]
num = [len(x) for x in result]
print(num)

d. 利用列表推导式删除列表中整数个位数小于5的元素

例如：[24, 'abc', 99, True, 21, 38, 'hello'] --- ['abc', 99, True, 38, 'hello']

result = [24, 'abc', 99, True, 21, 38, 'hello']
result1 = [x for x in result if (type(x) != int or x % 10 >=5)]
print(result1)

e. 利用列表推导式获取元素是元组的列表中每个元组的最后一个元素

例如：[(10, 20, 30), ('abc', 'hello'), (1, 2, 3.4), (True, False)]  --- [30, 'hello', 3.4, False]

result = [(10, 20, 30), ('abc', 'hello'), (1, 2, 3.4), (True, False)]
result1 = [x[-1] for x in result]
print(result1)

f.利用列表推导式将数字列表中所有的奇数乘以2，所有的偶数除以2

例如: [23, 4, 67, 88, 90, 21]  -> [46, 2, 134, 44, 45, 42]

num = [23, 4, 67, 88, 90, 21]
result = [ x // 2 if x % 2 == 0 else x * 2 for x in num]
print(result)

3. 已知一个列表获取列表中指定元素所有的下标

   例如：[10, 20, 34, 10, 9, 78]
   10的下标：[0, 3]
   20的下标：[1]
   30的下标：[]
   
   num = [10, 20, 34, 10, 9, 78]
   for x in num:
       y = num.index(x)
       print(x,'的下标：',y)
   

4. *已知一个数字列表，写程序判断这个列表时候是连续递增列表。

   例如：
   [1, 2, 3, 4, 5]   -> True
   [23, 45, 78, 90]  -> True
   [1, 3, 2, 4, 5]	-> False
   
   list1 = [1, 2, 3, 4, 5]
   min1 = -1
   pa = True
   for x in list1:
       if x > min1:
           min1 = x
       else:
           pa = False
           break
   if pa == True:
       print(list1,'True')
   else:
       print(list1,'False')
   

5. 已知两个列表，将两个列表按照下面的规律交叉合并

   A = [10, 20, 30, 40, 50]
   B = [100, 200, 300]
   结果：[10, 100, 20, 200, 30, 300, 40, 50]
   
   # 方法1：
    A = [10, 20, 30, 40, 50]
    B = [100, 200, 300]
    count1,count2 = len(A) , len(B)
    for x in range(count2):
        A.insert(2 * x + 1, B[x])
    print(A)
    
    # 方法2:
    A = [10, 20, 30, 40, 50]
    B = [100, 200, 300]
    C = []
    while True:
        C.append(A.pop(0))
        C.append(B.pop(0))
        if A == [] or B == []:
            break
    C += A + B
    print(C)
   

6. 已知两个有序列表，将两个列表合并，合并后的新列表中元素仍然是递增列表

   A = [10, 20, 30, 40, 50]
   B = [25, 44, 60]
   结果：[10, 20, 25, 30, 40, 45, 50, 60]
   
   

   A = [10, 20, 30, 40, 50]
   B = [25, 44, 60]
   C = A + B
   C.sort()
   print(C)