大约有 47,000 项符合查询结果（耗时：0.0860秒） [XML]
Delete column from pandas DataFrame
...index/columns keywords as an alternative to specifying the axis.
So we can now just do:
df.drop(columns=['B', 'C'])
share
|
improve this answer
|
follow
|
...
List comprehension vs. lambda + filter
...
didn't know reduce was demoted in Python3. thanks for the insight! reduce() is still quite helpful in distributed computing, like PySpark. I think that was a mistake..
– Tagar
Jun 28 '15 at 16:1...
EXC_BAD_ACCESS signal received
...you no longer have access to, and you therefore cannot call it.
UPDATE:
I now use Instruments to debug Leaks. From Xcode 4.2, choose Product->Profile and when Instruments launches, choose "Zombies".
share
|
...
How to get file_get_contents() to work with HTTPS?
...ne when I was using the test server (which wasn't calling an SSL URL), but now when I am testing it on the working server with HTTPS, it's failing with the error message "failed to open stream".
...
Getting time elapsed in Objective-C
...ate];
// do stuff...
NSTimeInterval timeInterval = [start timeIntervalSinceNow];
timeInterval is the difference between start and now, in seconds, with sub-millisecond precision.
share
|
improve t...
Visual Studio “Could not copy” … during build
... In Visual Studio 2019, I am getting a similar message, although it now mentions the process in some of the output (not all). It was testhost.x86.exe that I had to kill off via Task Manager. After that it did seem to stop detecting one of the test processes.
– Andez
...
What exactly does git rebase --skip do?
...s the commit still showing up in the log? And why does the missing commit now show up in the diff?
– mrwooster
Mar 2 '12 at 19:39
3
...
How to manage startActivityForResult on Android?
...w Intent();
setResult(Activity.RESULT_CANCELED, returnIntent);
finish();
Now in your FirstActivity class write following code for the onActivityResult() method.
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, result...
How to align absolutely positioned element to center?
...
If you want to center align an element without knowing it's width and height do:
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
Example:
*{
margin:0;
padding:0;
}
section{
background:red;
height: 100vh;
width: 100vw;
}...
How to grep Git commit diffs or contents for a certain word?
... Use some made-up, non-regexy words instead.
The git diff documentation now includes:
To illustrate the difference between -S<regex> --pickaxe-regex and
-G<regex>, consider a commit with the following diff in the same
file:
+ return frotz(nitfol, two->ptr, 1, 0);
...
- ...