Python 3.1 代码和错误
64位VISTA
Python 3.1
from urllib import request
a = request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
b = a[19000:20500]
idx_pricewrap = b.find('pricewrap')
context = b[idx_pricewrap:idx_pricewrap+80]
idx_bgLast = context.find('bgLast')
rate = context[idx_bgLast+8:idx_bgLast+15]
print(rate)
Traceback (most recent call last):
File "c:\P31Working\test_urllib.py", line 4, in
idx_pricewrap = b.find('pricewrap')
TypeError: expected an object with the buffer interface
Process terminated with an exit code of 1
我不知道该错误意味着什么。
请帮忙。
64-bit VISTA
Python 3.1
from urllib import request
a = request.urlopen('http://www.marketwatch.com/investing/currency/CUR_USDYEN').read(20500)
b = a[19000:20500]
idx_pricewrap = b.find('pricewrap')
context = b[idx_pricewrap:idx_pricewrap+80]
idx_bgLast = context.find('bgLast')
rate = context[idx_bgLast+8:idx_bgLast+15]
print(rate)
Traceback (most recent call last):
File "c:\P31Working\test_urllib.py", line 4, in
idx_pricewrap = b.find('pricewrap')
TypeError: expected an object with the buffer interface
Process terminated with an exit code of 1
I have NO idea what that error means.
Please help.
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Python 3 对于字节和 (Unicode) 字符串之间的区别更加严格。
urlopen(...).read(...)的结果当然是一个bytes类型的对象，而bytes.find< 的实现/code> 不允许您搜索 Unicode 字符串。在您的情况下，您可以简单地用二进制字符串替换“pricewrap”：这同样适用于其他
.find调用。 Python 2 在有意义（或多或少）的地方自动编码 Unicode 字符串，但 Python 3 引入了更多您需要注意的限制。Python 3 is a lot more strict when it comes to the difference between bytes and (Unicode) strings. The result of
urlopen(...).read(...)is of course an object of typebytes, and the implementation ofbytes.finddoesn't allow you to search for Unicode strings. In your case, you can simply replace "pricewrap" by a binary string:Same applies to other
.findcalls. Python 2 encoded Unicode strings automatically where it made (less or more) sense, but Python 3 has introduced more restrictions that you need to be aware of.我终于在文档中找到了相关示例：
http:// /docs.python.org/py3k/library/urllib.request.html?highlight=urllib#examples
第一个示例给了我一些理解，并引导我将代码修改为
http://tutoree7.pastebin.com/sUq8s4wh
效果就像一个魅力。
I finally find a relevant example in the docs:
http://docs.python.org/py3k/library/urllib.request.html?highlight=urllib#examples
The first example gave me some understanding and led me to revising my code to
http://tutoree7.pastebin.com/sUq8s4wh
which works like a charm.