python - 使用 Python 字典时出现 "ValueError: could not convert string to float:"

Question

我正在尝试将字符串复制到由 float 组成的字典中。我尝试在复制之前将字典值更改为字符串。它不起作用。我将问题分解为以下代码:

tst_dict = {}

tst_dict['name'] = np.zeros((2,3))

tst_dict['name'][0,0] = str(tst_dict['name'][0,0])
tst_dict['name'][0,0] = 'Hase'

ValueError: could not convert string to float: 'Hase'

感谢您的帮助。

Answer 1

使用dtype=object ，你会得到一个 python 对象引用数组。这样你就可以拥有Python字符串的所有行为:

import numpy as np

tst_dict = {}
tst_dict['name'] = np.zeros((2,3), dtype=object)
tst_dict['name'][0,0] = str(tst_dict['name'][0,0])
tst_dict['name'][0,0] = 'Hase'

print(tst_dict)

输出:

{'name': array([['Hase', 0, 0],
       [0, 0, 0]], dtype=object)}

编辑:

使用dtype='<U1'求单char在 str :

import numpy as np

tst_dict = {}
tst_dict['name'] = np.zeros((2,3), dtype='<U1')
tst_dict['name'][0,0] = str(tst_dict['name'][0,0])
tst_dict['name'][0,0] = 'Hase'

print(tst_dict)

输出:

{'name': array([['H', '', ''],
       ['', '', '']], dtype='<U1')}