numpy:通过数组比较创建向量不起作用 [英] Numpy: Creating a Vector through Array Comparison is NOT working
问题描述
如下面的IPython(Python 3)快照所示，我希望最后看到一个布尔值数组.但是，我看到只有1个布尔值返回.
As shown in the IPython (Python 3) snapshot below I expect to see an array of Boolean values printed in the end. However, I see ONLY 1 Boolean value returned.
- 无法确定原因?
- 每个字符之前的字符"b"是什么 第一个打印语句中的值表示什么?我用错了吗 我的numpy.getfromtxt()命令中的dtype = numpy.string _?
- Unable to identify why?
- What does the character 'b' before every value in the first print statement denote? Am I using the wrong dtype=numpy.string_ in my numpy.getfromtxt() command?
推荐答案
Python区分unicode字符串和ASCII字节.在Python3中，默认值是字符串"是unicode.
Python has the distinction between unicode strings and ASCII bytes. In Python3, the default is that "strings" are unicode.
以字符串"为前缀的 b 表示解释器将其视为字节.
The b prefixing the "strings", indicate that the interpreter considers these to be bytes.
为进行比较，您还需要将其与字节进行比较，即
For the comparison, you need to compare it to bytes as well, i.e.,
... == b"1984"
然后numpy将理解它应该在相同类型的元素上执行广播.
and then numpy will understand that it should perform broadcasting on same-type elements.
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