大约有 47,000 项符合查询结果（耗时：0.0741秒） [XML]
Count the number occurrences of a character in a string
...lest, but if you're doing this frequently, check out collections.Counter:
from collections import Counter
my_str = "Mary had a little lamb"
counter = Counter(my_str)
print counter['a']
share
|
imp...
How to use NSCache
...to make room.
If you can recreate those values at runtime (by downloading from the Internet, by doing calculations, whatever) then NSCache may suit your needs. If the data cannot be recreated (e.g. it's user input, it is time-sensitive, etc.) then you should not store it in an NSCache because it wi...
Calling a base class's classmethod in Python
...
If you're using a new-style class (i.e. derives from object in Python 2, or always in Python 3), you can do it with super() like this:
super(Derived, cls).do(a)
This is how you would invoke the code in the base class's version of the method (i.e. print cls, a), from the...
Using R to list all files with a specified extension
...
If dot means dot from file extension it won't work. Dot match single character in regular expression.
– Marek
Feb 2 '11 at 16:28
...
Software keyboard resizes background image on Android
...ground image doesn't contain relevant information. The problem I encounter from time to time is that my background will contain something like a logo, and setting the window background to the image hides the logo behind the ActionBar. For certain screens this isn't an issue, but sometimes I am requi...
How to keep a Python script output window open?
...
You have a few options:
Run the program from an already-open terminal. Open a command prompt and type:
python myscript.py
For that to work you need the python executable in your path. Just check on how to edit environment variables on Windows, and add C:\PYTHON2...
Regex: ignore case sensitivity
...hat if you want to ignore case for another word such as ".txt" and ".TXT". From looking at this answer I'm still unsure how I could do this.
– Kyle Bridenstine
Jun 12 '18 at 23:14
...
Passing variables to the next middleware using next() in Express.js
Well, my question is I want to pass some variable from the first middleware to another middleware, and I tried doing this, but there was " req.somevariable is a given as 'undefined'".
...
Should I use alias or alias_method?
...re predictable. Also, can you provide any practical example of benefitting from redefining alias_method?
– Boris Stitnicky
Nov 3 '12 at 19:17
7
...
Boost Statechart vs. Meta State Machine
...
Definitely, but I learned statecharts from discrete math, not software engineering. This leaves a mark :)
– blaze
Nov 25 '10 at 13:47
add ...