Question

我想组合一个numpy数组和一个列，我将一个字符串作为标识符导出到csv文件，然后我可以将其导入到excel中。

例如：

a=np.random.rand(6,4)
b=[]
for i in range(6):
  b.append('test')

所以现在我想将b附加到

的最后一列

一旦完成，我想使用np.savetxt（或类似的）将数组写入文件。

任何帮助非常感谢。

Answer 1

import numpy as np

a = np.random.rand(6,4)
b = ['test']*6

c = np.column_stack([a,b])
np.savetxt('/tmp/out', c, delimiter=',', fmt='%s')

写出类似

的内容

0.70503807191,0.19298150889,0.962915679186,0.655430709887,test
0.586655200042,0.379720344068,0.136924270418,0.547277504174,test
0.777238053817,0.642467338742,0.709351872598,0.932239808362,test
0.386983024375,0.753005132745,0.124107902275,0.472997270033,test
0.169711196953,0.735713880779,0.280588048467,0.726851876957,test
0.20578446385,0.379406838045,0.640154333103,0.579077700263,test

到/tmp/out。

根据Paul的建议，如果你有pandas，你可以很容易地形成一个DataFrame，然后调用它的to_csv方法：

import numpy as np
import pandas as pd

a = np.random.rand(6,4)
b = np.asarray(['test']*6)

df = pd.DataFrame(a)
df['b'] = b

df.to_csv('/tmp/out')

如何组合numpy数组和文本列并导出到csv

1 个答案: