列表推导式大全

1.用推导式写如下程序
(1)构建如下列表：[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
lst = [i * 2 for i in range(10)]
lst = [i for i in range(0,19,2) ]
print(lst)

(2)lst = ['alex', 'WuSir', '老女孩', '神秘女孩'] 将lst构建如下列表:['alex0', 'WuSir1', '老女孩2', '神秘女孩3']
方法一
lst = [i + str(lst.index(i)) for i in lst]
方法二
lst = [lst[i] + str(i) for i in range(len(lst)) ]
print(lst)

(3)构建如下列表：[(0, 1), (1, 2), (2, 3), (3, 4), (4, 5), (5, 6)]
lst = [ (j,i) for j in range(0,6) for i in range(1,7) if i-j == 1]
print(lst)

lst = [(i,i+1) for i in range(6)]
print(lst)

(4)求出50以内能被3整除的数的平方，并放入到一个列表中。
lst = [i ** 2 for i in range(51) if i % 3 == 0]
print(lst)

(5)M = [[1,2,3],[4,5,6],[7,8,9]], 把M中3,6,9组成新列表
M = [[1,2,3],[4,5,6],[7,8,9]]
lst = [ i[-1] for i in M ]
print(lst)

(6)构建如下列表：['python1期', 'python2期', 'python3期', 'python4期', 'python6期', 'python7期', 'python8期', 'python9期', 'python10期']
lst = [ "python{}期".format(i) for i in range(1,11) if i != 5 ]
print(lst)

(7)过滤掉长度小于3的字符串列表 , 并转换成大写字母
lst = ["sdfsdfsdfsdf","234","你说的符号是","a","ab"]
lst = [ i.upper() for i in lst if len(i) >=3 ]
print(lst)

(8)除了大小王,里面有52项,每一项是一个元组,请返回如下扑克牌列表[('红心'，'2'),('草花'，'J'), …('黑桃'，'A')]
lst1 = ["红心","草花","黑桃","方片"]
lst2 = ["A","2","3","4","5","6","7","8","9","10","J","Q","K"]
lst = [(i,j) for i in lst1 for j in lst2]
print(lst)

2.用推导式写如下程序
lst1 = {
'name':'alex',
'Values':[
{'timestamp': 1517991992.94,'values':100,},
{'timestamp': 1517992000.94,'values': 200,},
{'timestamp': 1517992014.94,'values': 300,},
{'timestamp': 1517992744.94,'values': 350},
{'timestamp': 1517992800.94,'values': 280}
]
}
将lst1 转化成如下 lst2:
lst2 = [
[1517991992.94, 100],
[1517992000.94, 200],
[1517992014.94, 300],
[1517992744.94, 350],
[1517992800.94, 280]
]
方法一
lst2 = [ [i["timestamp"] , i["values"]] for i in lst1["Values"] ]
print(lst2)

方法二
lst2 = [ list(i.values()) for i in lst1["Values"]]
print(lst2)