大约有 46,000 项符合查询结果（耗时：0.0486秒） [XML]
Generate random integers between 0 and 9
How can I generate random integers between 0 and 9 (inclusive) in Python?
19 Answers
1...
Get Substring - everything before certain char
I'm trying to figure out the best way to get everything before the - character in a string. Some example strings are below. The length of the string before - varies and can be any length
...
Ternary operator is twice as slow as an if-else block?
I read everywhere that ternary operator is supposed to be faster than, or at least the same as, its equivalent if - else block.
...
How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]
I have a = [1,2,3,4] and I want d = {1:0, 2:0, 3:0, 4:0}
5 Answers
5
...
dropping infinite values from dataframes in pandas?
what is the quickest/simplest way to drop nan and inf/-inf values from a pandas DataFrame without resetting mode.use_inf_as_null ? I'd like to be able to use the subset and how arguments of dropna , except with inf values considered missing, like:
...
Android OpenGL ES and 2D
Well, here's my request. I don't know OpenGL already, and I'm not willing to learn it, I want to learn OpenGL ES directly since I'm targeting my development to android, however. I want to learn OpenGL ES in order to develop my 2D games. I chose it for performances purpose (since basic SurfaceView ...
Write bytes to file
I have a hexadecimal string (e.g 0CFE9E69271557822FE715A8B3E564BE ) and I want to write it to a file as bytes. For example,
...
Getting the first character of a string with $str[0]
I want to get the first letter of a string and I've noticed that $str[0] works great. I am just not sure whether this is 'good practice', as that notation is generally used with arrays. This feature doesn't seem to be very well documented so I'm turning to you guys to tell me if it's all right –...
Drawing an image from a data URL to a canvas
How can i open an image in a Canvas ? which is encoded
6 Answers
6
...
How to write asynchronous functions for Node.js
I've tried to research on how exactly asynchronous functions should be written. After a lot of plowing through a lot of documentation, it's still unclear to me.
...