从Python中的列表列表中选择随机项

时间:2016-11-17 16:14:42

标签: python list

我有一系列不同长度的列表。从每个列表列表中,我需要随机选择10个项目。然后我必须将结果组合在一个列表中,每个列表项用逗号分隔。 (请参阅下面的输出)。不确定这是否可以在Python中使用。任何帮助将不胜感激。

[[-26.0490761  27.79991  ]
 [-25.9444218  27.9116535]
 [-26.1055737  27.7756424]
 ..., 
 [-26.036684   28.0508919]
 [-26.1367035  28.2753029]
 [-26.0668163  28.1137161]]

[[ 45.35693   -63.1701241]
 [ 44.6566162 -63.5969276]
 [ 44.7197456 -63.48137  ]
  ..., 
 [ 44.624588  -63.6244736]
 [ 44.6563835 -63.679512 ]
 [ 44.66706   -63.621582 ]]

我想以这种格式获得适合使用Folium在地图上绘制它们的输出。

 [[-26.0490761  27.79991],
  [-25.9444218  27.9116535],
  [ 44.6563835 -63.679512 ],
  [ 44.66706   -63.621582 ]]

我尝试了这段代码,但不确定出了什么问题:

  for cluster in clusters:
    for i in range(2):
       modifiedlist.append(cluster)

2 个答案:

答案 0 :(得分:1)

使用模块random

可以轻松完成此类操作
import random

def sampleFromLists(lists,n):
    """draws n elements from each list in lists
returning the result as a single list"""
    sample = []
    for subList in lists:
        sample.extend(random.sample(subList,n))
    return sample

示例数据(2元素列表的列表列表):

data = [
    [[-26.0490761, 27.79991],
     [-25.9444218, 27.9116535],
     [-26.1055737, 27.7756424],
     [-26.036684, 28.0508919],
     [-26.1367035, 28.2753029],
     [-26.0668163,28.1137161]],

    [[ 45.35693, -63.1701241],
     [44.6566162 -63.5969276],
     [44.7197456, -63.48137],
     [44.624588, -63.6244736],
     [44.6563835,-63.679512],
     [44.66706, -63.621582]]
]

然后:

>>> sampleFromLists(data,2)
[[-26.036684, 28.0508919], [-26.0490761, 27.79991], [44.7197456, -63.48137], [44.6563835, -63.679512]]

答案 1 :(得分:0)

import random

x = [[1,2],[3,4],[5,6],[7,8],[9],[7675,6456,4],[5,6]]

z = []
for i in range(10):
  y = random.choice(x)
  z.append([random.choice(y), random.choice(y)])

print(z)

random.choice()从给定输入中选择一个随机项(在我们的例子中是一个列表)。