使用.format（）在NumPy结构化数组和本机字符串格式中浮动

有人能告诉我为什么这个NumPy记录在Python的新样式字符串格式上有问题吗？记录中的所有浮动都在

“{:f}”上阻塞。格式化（记录）

谢谢你的帮助

In [334]: type(tmp)
Out[334]: numpy.core.records.record

In [335]: tmp
Out[335]: ('XYZZ', 2001123, -23.823917388916016)

In [336]: tmp.dtype
Out[336]: dtype([('sta', '|S6'), ('ondate', '<i8'), ('lat', '<f4')])

# Some formatting works fine
In [337]: '{0.sta:6.6s} {0.ondate:8d}'.format(tmp)
Out[337]: 'XYZZ    2001123'

# Any float has trouble
In [338]: '{0.sta:6.6s} {0.ondate:8d} {0.lat:11.6f}'.format(tmp)
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/Users/jkmacc/python/pisces/<ipython-input-338-e5f6bcc4f60f> in <module>()
----> 1 '{0.sta:6.6s} {0.ondate:8d} {0.lat:11.6f}'.format(tmp)

ValueError: Unknown format code 'f' for object of type 'str'

[334]中的

：类型（tmp）
Out[334]：numpy.core.records.record
In[335]：tmp
Out[335]：（'xyz'，2001123，-23.823917388916016）
In[336]：tmp.dtype
Out[336]：dtype（[（'sta'，'S6'），（'ondate'，'这个问题在NumPy用户邮件列表中的“floats被迫使用“{:f}”字符串”下得到了回答。format（）？”：

似乎np.int64/32和np.str继承了各自的本机Python
\uuuuuuu format\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

In [8]: '{:6.6s} {:8d} {:11.6f}'.format(tmp.sta, tmp.ondate, float(tmp.lat))
Out[8]: 'XYZZ    2001123  -23.820000'

谢谢

-乔恩

编辑：
np.float32/int32继承自本机Python类型如果系统是32位的，则继承自本机Python类型。与64位相同。不匹配将产生与原始post相同的问题