大约有 47,000 项符合查询结果（耗时：0.0644秒） [XML]
Display image as grayscale using matplotlib
...
The following code will load an image from a file image.png and will display it as grayscale.
import numpy as np
import matplotlib.pyplot as plt
from PIL import Image
fname = 'image.png'
image = Image.open(fname).convert("L")
arr = np.asarray(image)
plt.imshow(...
How does the String class override the + operator?
...so optimize away the
creation of a wrapper object by converting directly from a primitive
type to a string.
The optimized version will not actually do a full wrapped String conversion first.
This is a good illustration of an optimized version used by the compiler, albeit without the conversio...
How does a “stack overflow” occur and how do you prevent it?
...ur hands. You should look at your call graph (a tree structure that shows from your main what each function calls) to see how deep your function calls go, and to detect cycles and recursion that are not intended. Intentional cycles and recursion need to be artificially checked to error out if they...
Are Exceptions in C++ really slow
...ivial to measure:
The side-table is generally cold, and thus fetching it from memory takes a long time
Determining the right handler involves RTTI: many RTTI descriptors to fetch, scattered around memory, and complex operations to run (basically a dynamic_cast test for each handler)
So, mostly c...
How to do version numbers? [closed]
...e? Less of an R&D decision and more a product decision.
minor: Starts from 0 whenever major is incremented. +1 for every version that goes public.
release: Every time you hit a development milestone and release the product, even internally (e.g. to QA), increment this. This is especially impor...
Add file extension to files with bash
...pulation. ` ${string%substring}` Deletes shortest match of $substring from back of $string.
– Jichao
Aug 28 '15 at 19:36
...
Finding what methods a Python object has
...I believe that what you want is something like this:
a list of attributes from an object
In my humble opinion, the built-in function dir() can do this job for you. Taken from help(dir) output on your Python Shell:
dir(...)
dir([object]) -> list of strings
If called without an argument, retu...
What's the difference between RSpec and Cucumber? [closed]
...sting (which means testing a class or part of the application in isolation from the rest of the application. So your model does what your model is supposed to do, the controller does what it is supposed to do, etc).
RSpec and Cucumber both are used for Acceptance Testing (Which is called ATDD, BDD,...
Iteration ng-repeat only X times in AngularJs
...aving all of the implementation directly in the view, without any "assist" from the controller. This solution does exactly that...and is bloody clever to boot.
– karfus
Aug 24 '16 at 12:31
...
Can I add extension methods to an existing static class?
...h. Should the "container" actually be responsible for interpreting itself from the configuration file? Normally I simply have ConfigurationSectionHandler and cast the output from ConfigurationManager to the appropriate class and don't bother with the wrapper.
– tvanfosson
...