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Calling virtual functions inside constructors
...detail. I suggest reading that (and the rest of the FAQ) for a followup.
Excerpt:
[...] In a constructor, the virtual call mechanism is disabled because overriding from derived classes hasn’t yet happened. Objects are constructed from the base up, “base before derived”.
[...]
Destruction is ...
Get raw POST body in Python Flask regardless of Content-Type header
...a received in Flask request because request.data was empty. The answer explained that request.data is the raw post body, but will be empty if form data is parsed. How can I get the raw post body unconditionally?
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What is the difference between char array and char pointer in C?
...all cases. This is because arrays decay into pointers, meaning that if an expression of type char[] is provided where one of type char* is expected, the compiler automatically converts the array into a pointer to its first element.
Your example function printSomething expects a pointer, so if you t...
Smarty中date_format日期格式化详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的第几周数，从第一周的第一个星期一作为第一天开始
%x - 当前区域首选的时间表示法，不包括时间
%X - 当前区域首选的时间表示法，不包括日期
%y - 没有世纪数的十进制年份（范围从 00 到 99）
%Y - 包括世纪数的十进制年份
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Should import statements always be at the top of a module?
...e __init__.py of a plugin, which might be imported but not actually used. Examples are Bazaar plugins, which use bzrlib's lazy-loading framework.
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How to find all the subclasses of a class given its name?
....Bing'>}
Note that if the class definition of a subclass hasn't been executed yet - for example, if the subclass's module hasn't been imported yet - then that subclass doesn't exist yet, and __subclasses__ won't find it.
You mentioned "given its name". Since Python classes are first-class ob...
What are forward declarations in C++?
...file the linker is joining with the one that uses add to produce a dll or exe. It's possible that the linker may get the wrong add. Say you wanted to use int add(int a, float b), but accidentally forgot to write it, but the linker found an already existing int add(int a, int b) and thought that was ...
How do I use the nohup command without getting nohup.out?
...&1 & # runs in background, still doesn't create nohup.out
On Linux, running a job with nohup automatically closes its input as well. On other systems, notably BSD and macOS, that is not the case, so when running in the background, you might want to close input manually. While closing inpu...
How to get VM arguments from inside of Java application?
I need to check if some option that can be passed to JVM is explicitly set or has its default value.
5 Answers
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AttributeError: 'module' object has no attribute 'urlopen'
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This works in Python 2.x.
For Python 3 look in the docs:
import urllib.request
with urllib.request.urlopen("http://www.python.org") as url:
s = url.read()
# I'm guessing this would output the html source code ?
print(s)
...