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sql primary key and index
...r doesn't indicate that the PK index doesn't also already exist.
The additional index does no good, but the only harm (very small) is the additional file size and row-creation overhead.
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rvm installation not working: “RVM is not a function”
...n what a login shell is can be found here.
Thus, you need to check the option "Run as login shell" in the Gnome terminal's settings. It is required to open new terminal after this setting the flag.
Sometimes it is required to set the command to /bin/bash --login.
For remote connections it is im...
python design patterns [closed]
...ss Null(object):
def __init__(self, *args, **kwargs):
"Ignore parameters."
return None
def __call__(self, *args, **kwargs):
"Ignore method calls."
return self
def __getattr__(self, mname):
"Ignore attribute requests."
return self
de...
How do I get the picture size with PIL?
....open('whatever.png')
width, height = im.size
According to the documentation.
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Hide scroll bar, but while still being able to scroll
...xact scrollbar width will show up.
JavaScript Working Fiddle
Or
Using Position: absolute,
#parent{
width: 100%;
height: 100%;
overflow: hidden;
position: relative;
}
#child{
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: -17px; /* Increase/Decrease this v...
Make anchor link go some pixels above where it's linked to
I'm not sure the best way to ask/search for this question:
21 Answers
21
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Docker how to change repository name or rename image?
...en I run docker tag myname/server:latest docker sees fit to prepend docker.io, so the image tag ends up being docker.io/myname/server:latest.
– Scott
Jan 20 '16 at 21:18
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WebRTC vs Websockets: If WebRTC can do Video, Audio, and Data, why do I need Websockets? [closed]
So I'm looking to build a chat app that will allow video, audio, and text. I spent some time researching into Websockets and WebRTC to decide which to use. Since there are plenty of video and audio apps with WebRTC, this sounds like a reasonable choice, but are there other things I should consider? ...
Read specific columns from a csv file with csv module?
... out the last column, which shouldn't happen, but let me know if my assumption was wrong. Your posted code has a lot of indentation errors so it was hard to know what was supposed to be where. Hope this was helpful!
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C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
...BinaryFormatter类来实现的，这个类位于System.Runtime.Serialization.Formatters.Binary命名空间下。
SOAP序列化：对象序列化之后的结果符合SOAP协议，也就是可以通过SOAP 协议传输，通过System.Runtime.Serialization.Formatters.Soap命名空间下的SoapFormatte...