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How Scalable is SQLite? [closed]
...nd on the data used, and their format. I've had some tough experience with extra long tables (GPS records, one record per second). Experience showed that SQLite would slow down in stages, partly due to constant rebalancing of the growing binary trees holding the indexes (and with time-stamped indexe...
Creating a singleton in Python
...mple implementation:
class Singleton(type):
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
return cls._instances[cls]
class Logger(object):
__meta...
How can I check if a directory exists in a Bash shell script?
...e variable, like if [ -d "${THING:+$THING/}" ]. A directory won't mind the extra slash. A file will evaluate to false. Empty will remain empty, so false. And a symlink will be resolved to its destination. Of course, it depends on your goal. If you want to go there, this is fine. If you want to delet...
setting y-axis limit in matplotlib
...use the following.
import numpy as np # you probably alredy do this so no extra overhead
fig, axes = plt.subplot()
axes.plot(data[:,0], data[:,1])
xlim = axes.get_xlim()
# example of how to zoomout by a factor of 0.1
factor = 0.1
new_xlim = (xlim[0] + xlim[1])/2 + np.array((-0.5, 0.5)) * (xlim[1] ...
HTML text input field with currency symbol
...th content: '$' on inputs and adding an absolutely positioned element adds extra html - I like do to a background SVG inline css.
It goes something like this:
input {
width: 85px;
background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' heigh...
App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
...背景
用户反馈：WriteBytes 发送字符串硬件能收到，WriteStrings 发送却收不到。
同样的字符串数据，通过 WriteBytes 方法发送时硬件正常接收，但通过 WriteStrings 方法发送时硬件收不到或收到截断数据。
源码仓库: mit-cml/appinvent...
How do I list the functions defined in my shell?
...
grep is not a good solution for this, strings that match function definitions will cause false positives. @wjandrea can still be caught by multi line strings, as will any regex.
– Matt
Apr 7 '18 at 21:56
...
What's the best CRLF (carriage return, line feed) handling strategy with Git?
...[ Optional ] set core.safecrlf to true (to stop) or warn (to sing:) to add extra guard comparing if the reversed newline transformation would result in the same file
git config --global core.safecrlf true
B. Or per Repository Setup
1) Convert all to one format
find . -type f -not -path "./.gi...
How to remove convexity defects in a Sudoku square?
...(ri+1)*50-1 , ci*50:(ci+1)*50-1].copy TypeError: long() argument must be a string or a number, not 'builtin_function_or_method'
– user898678
Feb 6 '13 at 21:38
...
Message Queue vs. Web Services? [closed]
...in service discovery, even for a task that has multiple steps, without any extra complicated protocols.
GET /task/name
- returns form with required fields
POST (URL provided form's "action" attribute)
Your service discovery is an HTML form - a universal and human readable format.
The en...