大约有 23,000 项符合查询结果（耗时：0.0204秒） [XML]
Find element's index in pandas Series
...
>>> myseries[myseries == 7]
3 7
dtype: int64
>>> myseries[myseries == 7].index[0]
3
Though I admit that there should be a better way to do that, but this at least avoids iterating and looping through the object and moves it to the C level.
...
iOS: how to perform a HTTP POST request?
...sion, downloadTask: URLSessionDownloadTask,
didWriteData bytesWritten: Int64, totalBytesWritten writ: Int64, totalBytesExpectedToWrite exp: Int64) {
print("downloaded \(100*writ/exp)" as AnyObject)
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, d...
.NET JIT potential error?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
Draft saved
Draft discarded
...
Deleting DataFrame row in Pandas based on column value
...
If you want to delete rows based on multiple values of the column, you could use:
df[(df.line_race != 0) & (df.line_race != 10)]
To drop all rows with values 0 and 10 for line_race.
...
TortoiseSVN icons not showing up under Windows 7
...and then back on, and the Tortise overlay icons reappeared. I'm using the 64-bit version of both Win7 and TortiseSVN.
– Chris Staley
Aug 30 '09 at 1:20
96
...
Crop MP3 to first 30 seconds
... does not transcode. It is lightning fast.
NOTE: the command was updated based on comment from Oben Sonne
share
|
improve this answer
|
follow
|
...
Hashing a string with Sha256
...ash += bit.ToString("x2"); I've a question here: I was using Convert.ToBase64String(byte[] encryptedBytes) to convert back from bytes to string. that was giving me different result. so what is the different between these two methods of converting from bytes to string..?
– Keval...
How to strip all non-alphabetic characters from string in SQL Server?
...
+1 George. This is one of those places where "Set-Based" code and the use of Inline Scalar Functions have great difficulty in beating Row-By-Row. Nicely done. I've also been using your "Initial Caps" function, which has the same basic form, for a couple of years, now.
...
Simple proof that GUID is not unique [closed]
... hear your reasoning to your theory. I think we could start a new religion based on this and recruit T.Cruise!
– ErocM
Oct 19 '11 at 14:02
...
How can I update npm on Windows?
...
Note 32 and 64 bit MSIs. Do not just click on "Windows Installer" link - that's 32 bit. Check where your current nodejs resides, in "Program Files" or on "Program Files (x86)". The "x86" means 32-bit. See the comments below about "old ...