大约有 15,000 项符合查询结果（耗时：0.0236秒） [XML]
How can I use UUIDs in SQLAlchemy?
...ar value for all instances of this class. More details here:
A scalar, Python callable, or ColumnElement expression representing the default value for this column, which will be invoked upon insert if this column is otherwise not specified in the VALUES clause of the insert.
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argparse module How to add option without any argument?
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How to get certain commit from GitHub project
...sing the 7-digit SHA1 short form do:
Working Example:
https://github.com/python/cpython/archive/31af650.zip
Description:
`https://github.com/username/projectname/archive/commitshakey.zip`
If you have the long hash key 31af650ee25f65794b75d4dfefed6fe4758781c1, just get the first 7 chars...
Group by & count function in sqlalchemy
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Calculate distance between 2 GPS coordinates
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Here's a Haversine function in Python that I use:
from math import pi,sqrt,sin,cos,atan2
def haversine(pos1, pos2):
lat1 = float(pos1['lat'])
long1 = float(pos1['long'])
lat2 = float(pos2['lat'])
long2 = float(pos2['long'])
degree_to...
How do you query for “is not null” in Mongo?
...({"IMAGE URL":{"$ne":None}});
Because pymongo represents mongo "null" as python "None".
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Move the mouse pointer to a specific position?
... a small web server on the client machine. Can be a small 100kb thing. A Python / Perl script, etc.
Include a small, pre-compiled C executable that can move the mouse.
Run it as a CGI-script via a simple http call, AJAX, whatever - with the coordinates you want to move the mouse to, eg:
http://lo...
libpng warning: iCCP: known incorrect sRGB profile
...nality. However, I had images buried in sub-folders, so I used this simple Python script to apply this to all images in all sub-folders and thought it might help others:
import os
import subprocess
def system_call(args, cwd="."):
print("Running '{}' in '{}'".format(str(args), cwd))
subproc...
Get encoding of a file in Windows
...iations of Get-FileEncoding on poshcode. I've even reviewed punycode from python and nodejs, but this small version hits 80/20 for my usage (more like 99/1). If you're hosting other people's files I suggest you use file command from Syben's answer (stackoverflow.com/a/34766140/195755) or another pr...
How do I determine k when using k-means clustering?
... Just adding a link to the Silhouette Analysis tutorial for python users scikit-learn.org/stable/auto_examples/cluster/…
– Chaitanya Shivade
May 8 '17 at 17:46
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