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How do I create a constant in Python?
...n answer, far below, with a short and simple implementation of "Constants" for python 2.7 (which lacks "enum"). These are enum-like read-only name.attribute, and can contain any value. Declaration is easy Nums = Constants(ONE=1, PI=3.14159, DefaultWidth=100.0), Usage is straightforward print 10 + Nu...
Facebook Callback appends '#_=_' to Return URL
...
via Facebook's Platform Updates:
Change in Session Redirect Behavior
This week, we started adding a fragment #____=____ to the redirect_uri when
this field is left blank. Please ensure that your app can handle this
behavior.
To p...
Formatting numbers (decimal places, thousands separators, etc) with CSS
Is it possible to format numbers with CSS?
That is: decimal places, decimal separator, thousands separator, etc.
10 Answers...
enum - getting value of enum on string conversion
... it returns as object. Ex: if D.x == 10: .... What approach should I take for integers?
– alper
Apr 24 at 18:49
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Weighted random numbers
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There is a straightforward algorithm for picking an item at random, where items have individual weights:
1) calculate the sum of all the weights
2) pick a random number that is 0 or greater and is less than the sum of the weights
3) go throu...
How to check a string for specific characters?
...e above...
s.find('$')==-1 # not found
s.find('$')!=-1 # found
And so on for other characters.
... or
pattern = re.compile(r'\d\$,')
if pattern.findall(s):
print('Found')
else
print('Not found')
... or
chars = set('0123456789$,')
if any((c in chars) for c in s):
print('Found')
els...
MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...ssage
-v [ --verbose ] be more verbose (include multiple times for more
verbosity e.g. -vvvvv)
--version print the program's version and exit
-h [ --host ] arg mongo host to connect to ( <set name>/s1,s2 for sets)
--port arg ...
How can I represent an 'Enum' in Python?
... also been backported to 3.3, 3.2, 3.1, 2.7, 2.6, 2.5, and 2.4 on pypi.
For more advanced Enum techniques try the aenum library (2.7, 3.3+, same author as enum34. Code is not perfectly compatible between py2 and py3, e.g. you'll need __order__ in python 2).
To use enum34, do $ pip install enum3...
How to write a Python module/package?
I've been making Python scripts for simple tasks at work and never really bothered packaging them for others to use. Now I have been assigned to make a Python wrapper for a REST API. I have absolutely no idea on how to start and I need help.
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Append an object to a list in R in amortized constant time, O(1)?
...th it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(oldlist, list(someobj))
In general, R types can make it hard to have one and just one idiom for all types and uses.
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