大约有 22,000 项符合查询结果（耗时：0.0464秒） [XML]
mongodb: insert if not exists
...u want to do an "upsert". MongoDB has built-in support for this. Pass an extra parameter to your update() call: {upsert:true}. For example:
key = {'key':'value'}
data = {'key2':'value2', 'key3':'value3'};
coll.update(key, data, upsert=True); #In python upsert must be passed as a keyword argumen...
Best way to include CSS? Why use @import?
...faster and better), and nearly all browsers support link
import loads any extra css files one-by-one (slower), and could give you Flash Of Unstyled Content
share
|
improve this answer
|
...
Peak-finding algorithm for Python/SciPy
...ers width, threshold, distance and above all prominence to get a good peak extraction.
According to my tests and the documentation, the concept of prominence is "the useful concept" to keep the good peaks, and discard the noisy peaks.
What is (topographic) prominence? It is "the minimum height nec...
Requests — how to tell if you're getting a 404
...t requests.get to raise for any reason except a 2XX without having to make extra calls.
– Asfand Qazi
Jan 31 '19 at 12:12
...
Error when trying to obtain a certificate: The specified item could not be found in the keychain
...nal)
Allow access to export key
Open Terminal and go to exported directory
Extract key from p12 container
Be careful as the .pem private key is no longer password protected)
$ openssl pkcs12 -in Certificates.p12 -out Certificates.pem -nodes
Enter Import Password: ********************
MAC verifie...
Maven: best way of linking custom external JAR to my project?
...g with maven I suggest to use maven directly not IDE plugins as it adds an extra layer of complexity.
As for the error, do you put the required jars on your classpath? If you are using types from the library, you need to have access to it in the runtime as well. This has nothing to do with maven it...
How do I generate random integers within a specific range in Java?
...this case means that after 2^53 executions, some numbers will have had one extra occourance, on average.
– Cephalopod
Aug 29 '19 at 9:48
add a comment
|
...
How to move screen without moving cursor in Vim?
...
:help CTRL-E says Mnemonic: Extra lines.
– Niko Bellic
Jan 27 '17 at 23:55
|
show 1 more comm...
It is more efficient to use if-return-return or if-else-return?
...e blocks when possible. See the Anti-if Campaign
Also, they don't charge 'extra' for the line, you know :p
"Simple is better than complex" & "Readability is king"
delta = 1 if (A > B) else -1
return A + delta
sha...
What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?
...rator<<(std::endl);. and since there is a free function which takes char const* as second argument, "\n" works; '\n' would work as well.
– Nawaz
Jun 6 '16 at 5:42
...