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Stripping everything but alphanumeric chars from a string in Python
... fastest.
$ python -m timeit -s \
"import string" \
"''.join(ch for ch in string.printable if ch.isalnum())"
10000 loops, best of 3: 57.6 usec per loop
$ python -m timeit -s \
"import string" \
"filter(str.isalnum, string.printable)"
10000 loops, best of 3: 37.9...
Variable interpolation in the shell
...cause you're trying to do string interpolation, and you need double quotes for that
– michaelsnowden
Oct 3 '15 at 22:12
...
How can I use PowerShell with the Visual Studio Command Prompt?
I've been using Beta 2 for a while now and it's been driving me nuts that I have to punt to cmd.exe when running the VS2010 Command Prompt. I used to have a nice vsvars2008.ps1 script for Visual Studio 2008. Anyone have a vsvars2010.ps1 or something similar?
...
Allowed characters in Linux environment variable names
...iable names? My cursory search of man pages and the web did only produce information about how to work with variables, but not which names are allowed.
...
How much faster is Redis than mongoDB?
...on you can adapt to your purposes, I was looking at how well each would perform simply setting/retrieving values:
#!/usr/bin/env python2.7
import sys, time
from pymongo import Connection
import redis
# connect to redis & mongodb
redis = redis.Redis()
mongo = Connection().test
collection = mong...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...ore a start timestamp to each. How? We could construct a unique identifier for each read, and use that as the key. But because kernel threads can only be executing one syscall at a time, we can use the thread ID as the unique identifier, as each thread cannot be executing more than one.
nsecs: 自...
If isset $_POST
I have a form on one page that submits to another page. There, it checks if the input mail is filled. If so then do something and if it is not filled, do something else. I don't understand why it always says that it is set, even if I send an empty form. What is missing or wrong?
...
“Private” (implementation) class in Python
...prefix:
class _Internal:
...
This is the official Python convention for 'internal' symbols; "from module import *" does not import underscore-prefixed objects.
Edit: Reference to the single underscore convention
sha...
What is the purpose of python's inner classes?
...onic: "Namespaces are one honking great idea -- let's do more of those!". For example, consider a DataLoader class that can throw a CacheMiss exception. Nesting the exception under the main class as DataLoader.CacheMiss means you can import just DataLoader but still use the exception.
...
Passing a std::array of unknown size to a function
...mulArray(std::array<int, SIZE>& arr, const int multiplier) {
for(auto& e : arr) {
e *= multiplier;
}
}
Here is a live example.
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