大约有 15,000 项符合查询结果（耗时：0.0344秒） [XML]
Join a list of items with different types as string in Python
...d only convert the integers to strings when you need to display them. For example, if you have a list of integers then you can convert them one by one in a for-loop and join them with ,:
print(','.join(str(x) for x in list_of_ints))
...
How to store a command in a variable in a shell script?
...
Use eval:
x="ls | wc"
eval "$x"
y=$(eval "$x")
echo "$y"
share
|
improve this answer
|
follow
...
Scala Doubles, and Precision
...nance can require rounding and also performance.
– Rex Kerr
Jun 19 '12 at 20:33
28
...
Using global variables in a function
...ants to make sure that you really know that's what you're playing with by explicitly requiring the global keyword.
See other answers if you want to share a global variable across modules.
share
|
im...
Change all files and folders permissions of a directory to 644/755
...change all files to 644 and all folders to 755 using chmod from the linux command prompt? (Terminal)
8 Answers
...
What is the best way to repeatedly execute a function every x seconds?
I want to repeatedly execute a function in Python every 60 seconds forever (just like an NSTimer in Objective C). This code will run as a daemon and is effectively like calling the python script every minute using a cron, but without requiring that to be set up by the user.
...
How to install a previous exact version of a NPM package?
...ckage, just specify it
npm install <package>@<version>
For example: npm install express@3.0.0
You can also add the --save flag to that command to add it to your package.json dependencies, or --save --save-exact flags if you want that exact version specified in your package.json depen...
Convert a number range to another range, maintaining ratio
...
NewValue = (((OldValue - OldMin) * (NewMax - NewMin)) / (OldMax - OldMin)) + NewMin
Or a little more readable:
OldRange = (OldMax - OldMin)
NewRange = (NewMax - NewMin)
NewValue = (((OldValue - OldMin) * NewRange) / OldRange) + NewMin
Or if you want to pr...
Is there a builtin identity function in python?
...
advantage: takes any number of parameters
disadvantage: the result is a boxed version of the parameters
OR
_ = lambda x: x
advantage: doesn't change the type of the parameter
disadvantage: takes exactly 1 positional parameter
...
adding noise to a signal in python
...
In some contexts, it might make more sense to multiply your signal by a noise array (centered around 1), rather than adding a noise array, but of course that depends on the nature of the noise that you're trying to simulate.
...