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Days between two dates? [duplicate]
...r days, or groups of 24 hours?
For simply 24 hours, assuming you're using Python's datetime, then the timedelta object already has a days property:
days = (a - b).days
For calendar days, you'll need to round a down to the nearest day, and b up to the nearest day, getting rid of the partial day o...
使用 XML 和 Web 服务 · App Inventor 2 中文网
... 我要 分享 扫码分享到朋友圈 顶部 var qrcode = new QRCode("qrcode", { text: window.location.href + "?f=share", //URL地址 width: 150, height: 150, colorDark: '#000000', //二维码颜色 colorLight: "#ffffff" ...
Why does pylint object to single character variable names?
I'm still getting used to python conventions and using pylint to make my code more pythonic, but I'm puzzled by the fact that pylint doesn't like single character variable names. I have a few loops like this:
...
How to store a dataframe using Pandas
...tter for interoperability, as a faster alternative to JSON, or if you have python object/text-heavy data (see this question).
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Which is faster: Stack allocation or Heap allocation
...a access."
Declare e volatile, but volatile is often compiled incorrectly (PDF).
Take the address of e inside the loop (and maybe assign it to a variable that is declared extern and defined in another file). But even in this case, the compiler may notice that -- on the stack at least -- e will alwa...
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
... the two arrays to be evaluated in boolean context (by
calling __bool__ in Python3 or __nonzero__ in Python2).
Your original code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any...
Counting inversions in an array
...
In Python
# O(n log n)
def count_inversion(lst):
return merge_count_inversion(lst)[1]
def merge_count_inversion(lst):
if len(lst) <= 1:
return lst, 0
middle = int( len(lst) / 2 )
left, a = merge_cou...
Get list of all routes defined in the Flask app
...ution above is too complex.
Just open a new shell under your project:
python
>>> from app import app
>>> app.url_map
The first 'app' is my project script: app.py,
another is my web's name.
(this solution is for tiny web with a little route)
...
Group vs role (Any real difference?)
...rence between roles and groups.
http://profsandhu.com/workshop/role-group.pdf
A group is a collection of users with a given set of permissions assigned to the group (and transitively, to the users). A role is a collection of permissions, and a user effectively inherits those permissions when he ac...
Slow Requests on Local Flask Server
...g webservers.
Update (2020-07-25): It looks like gevent started supporting python3 5 years ago, shortly after I commented that it didn't, so you can use gevent now.
gevent
You can install gevent through pip with the command pip install gevent or pip3 with the command pip3 install gevent. Instruction...