Python字节字符串在字典中打印不正确 [英] Python byte string print incorrectly in dictionary
问题描述
请考虑一个列表,其中包含以字节为单位的数据(即['\x03','\x00','\x32',...])
Consider a list contains data in byte (i.e ['\x03', '\x00', '\x32', ... ])
temp = b''
for c in field_data:
temp += c
print "%x" % ord(c)
正确地将所有字节连接为temp(字节字面量)。但是,当我将其添加到字典元素中时,在某些情况下输出是错误的。
above code correctly concatenates all bytes into temp (byte string literal). But when I added this into element of dictionary, output was incorrect in some cases.
testdic = {'dd':temp}
print testdic
例如,列表中有0x0 0x0 0x0 0x0 0x0 0x0 0x33 0x32第一个代码显示所有字节均已正确连接。但是当我紧接着执行第二个代码时,输出是这样的:
For example, 0x0 0x0 0x0 0x0 0x0 0x0 0x33 0x32 are in list and first code show all bytes were correctly concatenated. But when I executed second code right after, output was like this:
{'dd': '\x00\x00\x00\x00\x00\x0032'}
我不确定为什么会这样。
And I'm not entirely sure why this happens.
推荐答案
当打印 dict
时,它会打印括号 {
和}
以及内容的表示形式。
When you print a dict
, it prints the braces {
and }
along with a representation of the contents.
>>> b = b'\x00\x0f\xff'
>>> print b
�
>>> print repr(b)
'\x00\x0f\xff'
>>> print {'test':b}
{'test': '\x00\x0f\xff'}
编辑
数字0x33& 0x32是字符 3和 2的ASCII值。 repr
将直接显示可打印的ascii字符,而对不可打印的字符使用 \x00
表示法。
The numbers 0x33 & 0x32 are the ASCII values of the characters '3' and '2'. repr
will show printable ascii characters directly, while using the \x00
notation for non-printable characters.
>>> b = b'\x33\x32'
>>> print b
32
>>> print repr(b)
'32'
>>> hex(ord('3'))
'0x33'
这是我
>>> def hexstr(s):
... return '-'.join('%02x' % ord(c) for c in s)
...
>>> hexstr(b'\x00\xff\x33\x32')
'00-ff-33-32'
如果您可以继承 dict
的子类并覆盖 __ str __
表示形式希望这种情况自动发生。
You might be able to subclass dict
and override the __str__
representation if you want this to happen automatically.
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