第十章：数据结构

vec = [2, 4, 6]

print([3*x for x in vec])

print(vec)

vec2 = [[x, x+1] for x in vec]

print(vec2)

vec3 = [3*x for x in vec if x>3]

print(vec3)

matrix = [

    [1, 2, 3, 4],

    [5, 6, 7, 8],

    [9, 10, 11, 12],

]

matrix2 = [[row[i] for row in matrix] for i in range(4)]

print(matrix2)

t =123, 345, 'hello'

print(t[0])

u = t, 1.2, 3.5, 'world'

print(u)

knights = {'gallahad':'the pure', 'robin':'the brave'}

for k, vin knights.items():

      print(k, v)

questions = ['name', 'quest', 'favorite color']

answers = ['lancelot', 'the holy grail', 'blue']

for q, ain zip(questions, answers):

      print('What is your {0}? It is {1}.'.format(q, a))

输出：

[6, 12, 18]

[2, 4, 6]

[[2, 3], [4, 5], [6, 7]]

[12, 18]

[[1, 5, 9], [2, 6, 10], [3, 7, 11], [4, 8, 12]]

123

((123, 345, 'hello'), 1.2, 3.5, 'world')

gallahad the pure

robin the brave

What is your name? It is lancelot.

What is your quest? It is the holy grail.

What is your favorite color? It is blue.