我编写了以下脚本,以numpy数组形式从CSV文件加载数据:
import numpy
sample = numpy.genfromtxt('sample_cor.csv', delimiter = ',')
print sample
此示例看起来像:
[[ 259463.392 2737830.062 ]
[ 255791.4823 2742050.772 ]
[ 249552.4949 2746152.328 ]
[ 247925.1228 2746422.143 ]
[ 262030.4697 2728966.229 ]
[ 260462.1936 2731412.856 ]
[ 260644.0281 2735003.027 ]
[ 268588.7974 2732835.097 ]]
现在我想将这个数组中的每一行提取为逗号字符串,例如,我希望第1行转换为259463.392,2737830.062
,第2行转换为255791.4823,2742050.772
,依此类推。
我尝试了以下代码:
ss = numpy.array_str(sample[0])
print ss
print type(ss)
并且结果可能不是我想要的,
[ 259463.392 2737830.062]
<type 'str'>
(我使用了coords = '259467.2,2737833.87'
并获得了我想要的字符串形式:
259467.2,2737833.87
)
如何将numpy数组中的元素转换为带逗号的字符串?
答案 0 :(得分:6)
这是一种使用join method
-
[",".join(item) for item in a.astype(str)]
示例运行 -
In [141]: a
Out[141]:
array([[ 259463.392 , 2737830.062 ],
[ 255791.4823, 2742050.772 ],
[ 249552.4949, 2746152.328 ],
[ 247925.1228, 2746422.143 ],
[ 262030.4697, 2728966.229 ],
[ 260462.1936, 2731412.856 ],
[ 260644.0281, 2735003.027 ],
[ 268588.7974, 2732835.097 ]])
In [142]: [",".join(item) for item in a.astype(str)]
Out[142]:
['259463.392,2737830.062',
'255791.4823,2742050.772',
'249552.4949,2746152.328',
'247925.1228,2746422.143',
'262030.4697,2728966.229',
'260462.1936,2731412.856',
'260644.0281,2735003.027',
'268588.7974,2732835.097']