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What is the difference between concurrency and parallelism?
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@thebugfinder, To make sure there is no more room for error in Thomas' example. Concurrency is like a person juggling with only 1 hand. Regardless of how it seems the person is only holding at most one ball at a time. Parallelism is when the juggler uses both hands.
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Difference between len() and .__len__()?
...t recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'str' object cannot be interpreted as an integer
When you see a call to the len built-in, you're sure that, if the program continues after that rather than raising an exception, the call has returned an integer, non-...
Is ServiceLocator an anti-pattern?
...y scanning all constructors). So with those containers you get the runtime error directly, and not at some later temporal point.
Also, author mentioned about unit test difficulties. But, won't we have issues with DI approach?
No. As you do not have a dependency to a static service locator. Have yo...
How do I set a cookie on HttpClient's HttpRequestMessage
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I've been chasing for several days an error in which requests sent with SendAsync did not send the cookie header; this helped me realize that, unless you set UseCookies = false in the Handler, it will not only use the CookieContainer, but also silently ignore any...
GDB corrupted stack frame - How to debug?
...bt and figure out where the code really is.
The other 1% of the time, the error will be due to overwriting the stack, usually by overflowing an array stored on the stack. In this case, you might be able to get more clarity on the situation by using a tool like valgrind
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Setting default permissions for newly created files and sub-directories under a directory in Linux?
...ry is located on your root filesystem:
/dev/mapper/qz-root / ext3 errors=remount-ro,acl 0 1
Then remount it:
mount -oremount /
Now, use the following command to set the default ACL:
setfacl -dm u::rwx,g::rwx,o::r /shared/directory
All new files in /shared/directory should now get...
How can I dynamically create derived classes from a base class
...Factory call
if key not in argnames:
raise TypeError("Argument %s not valid for %s"
% (key, self.__class__.__name__))
setattr(self, key, value)
BaseClass.__init__(self, name[:-len("Class")])
newclass = type(name, (BaseClass,),{...
Why does an overridden function in the derived class hide other overloads of the base class?
...b)
{
a.copy(&b); // ok: copy Base part of b
b.copy(&a); // error: copy(Base*) is hidden by copy(Derived*)
}
Without this rule, b's state would be partially updated, leading to slicing.
This behavior was deemed undesirable when the language was designed. As a better approach, it wa...
What is the boundary in multipart/form-data?
...hment. Explicit provision of content-type as multipart/form-data throws an error. Because boundary is missing as it overrides the curl request of post man to server with content-type by appending the boundary which works fine.
See RFC1341 sec7.2 The Multipart Content-Type
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What are the differences between poll and select?
...h sockets and file descriptors you want to watch for reading, writing, and errors, and then the operating system marks which ones in fact have had some kind of activity; poll() has you create a list of descriptor IDs, and the operating system marks each of them with the kind of event that occurred.
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