大约有 42,000 项符合查询结果（耗时：0.0321秒） [XML]
How to reliably open a file in the same directory as a Python script
...ame directory as the currently running Python script by simply using a command like
5 Answers
...
How can mixed data types (int, float, char, etc) be stored in an array?
... x = r;
x.val = 25.0;
}
integer g = { INT, 100 };
record rg = g;
Up-casting and down-casting.
Edit: One gotcha to be aware of is if you're constructing one of these with C99 designated initializers. All member initializers should be through the same union member.
record problem = { .tag ...
How does a debugger work?
...ary the one that can be 'attached' to already running executable. I understand that compiler translates code to machine language, but then how does debugger 'know' what it is being attached to?
...
Can you Run Xcode in Linux?
...Xcode (the gcc compiler family, the gdb debugger, etc.) is all open source and common to Unix and Linux platforms. But the IDE--the editor, project management, indexing, navigation, build system, graphical debugger, visual data modeling, SCM system, refactoring, project snapshots, etc.--is a Mac OS...
Why use symbols as hash keys in Ruby?
... basically "immutable strings" .. that means that they can not be changed, and it implies that the same symbol when referenced many times throughout your source code, is always stored as the same entity, e.g. has the same object id.
Strings on the other hand are mutable, they can be changed anytim...
How can I check the extension of a file?
...swith('.mp3'):
...
elif m.endswith('.flac'):
...
To be case-insensitive, and to eliminate a potentially large else-if chain:
m.lower().endswith(('.png', '.jpg', '.jpeg'))
share
|
improve this an...
Setting environment variables on OS X
...
Bruno is right on track. I've done extensive research and if you want to set variables that are available in all GUI applications, your only option is /etc/launchd.conf.
Please note that environment.plist does not work for applications launched via Spotlight. This is documented...
How do I copy a file in Python?
...sts, it will be replaced.
Special files such as character or block devices and pipes cannot be copied with this function.
With copy, src and dst are path names given as strings.
If you use os.path operations, use copy rather than copyfile. copyfile will only accept strings.
...
What is the strict aliasing rule?
... struct onto such a buffer, or a buffer onto such a struct through pointer casting you can easily violate strict aliasing rules.
So in this kind of setup, if I want to send a message to something I'd have to have two incompatible pointers pointing to the same chunk of memory. I might then naively co...
How can I build a small operating system on an old desktop computer? [closed]
...things first. Read, read, read, read, read. You need to have a firm understanding of how the OS works before you can hope to implement your own.
Grab one of Andrew Tanenbaum's books on operating systems. This is the one we used in my OS class in college:
Modern Operating Systems PDF
Modern Op...