Python numpy.genfromtxt

Question

有人知道吗，我如何从尝试使用numpy.genfromtxt读取的文本文件中跳过括号我的数据文件的格式是

1.466 ((5.68 3.3 45.7)(4.5 6.7 9.5))

Answer 1

np.genfromttxt可以接受迭代器：

import numpy as np
import re
with open('data', 'r') as f:
    lines = (line.replace('(',' ').replace(')',' ') for line in f)
    arr = np.genfromtxt(lines)
print(arr)

产生

[  1.466   5.68    3.3    45.7     4.5     6.7     9.5  ]

---

或者，您可以使用（在Python 2中）str.translate或（在Python 3中）bytes.translate方法，后者稍微快一点：

import numpy as np
import re
try:
    # Python2
    import string
    table = string.maketrans('()','  ')
except AttributeError:
    # Python3
    table = bytes.maketrans(b'()',b'  ')
with open('data', 'rb') as f:
    lines = (line.translate(table) for line in f)
    arr = np.genfromtxt(lines)
print(arr)