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MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update
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Beginning with MongoDB 2.4, it's no longer necessary to rely on a unique index (or any other workaround) for atomic findOrCreate like operations.
This is thanks to the $setOnInsert operator new to 2.4, which allows you to specify updates which should only happen when inserting documents.
This, c...
MLKitObjectDetector 拓展：离线目标检测（找出物体并画框） · App Inventor 2 中文网
...tion
scale = 画布1.Width / imageWidth
}
when ObjectDetector1.GotObject(index, x, y, width, height, label, confidence, trackingId) {
画布1.PaintColor = -65536
画布1.DrawLine(x * scale, y * scale, (x + width) * scale, y * scale)
画布1.DrawLine((x + width) * scale, y * scale, (x + width...
Recommendations of Python REST (web services) framework? [closed]
...cherrypy
from cherrypy import expose
class Converter:
@expose
def index(self):
return "Hello World!"
@expose
def fahr_to_celc(self, degrees):
temp = (float(degrees) - 32) * 5 / 9
return "%.01f" % temp
@expose
def celc_to_fahr(self, degrees):
...
Versioning SQL Server database
...ibes in more detail what it does. red-gate.com/products/SQL_Source_Control/index.htm
– David Atkinson
Jul 1 '10 at 9:13
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Remove Server Response Header IIS7
...stem.webServer. Beware, this will crash your site if UrlRewrite is not installed on the server. And you'd better use the IIS configuration console first to check how it write down those config nodes.
– Frédéric
Sep 4 '15 at 19:31
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How to get last items of a list in Python?
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a negative index will count from the end of the list, so:
num_list[-9:]
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Pandas count(distinct) equivalent
...col).strip() for col in grp_df.columns.values]
# if you wish to reset the index
grp_df.reset_index(inplace=True)
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Regular expression for first and last name
... I would escape the special characters in these regexps - especially . (decimal point/dot/full stop) since it's the regexp wildcard =)
– Joel Purra
Aug 8 '12 at 18:45
32...
How do I create a multiline Python string with inline variables?
...ct)
print(multiline_string)
Also a list can be passed to format(), the index number of each value will be used as variables in this case.
list = ['go',
'now',
'great']
multiline_string = '''I'm will {0} there
I will go {1}
{2}'''.format(*list)
print(multiline_string)
Both s...
Rails params explained?
...e "1" and params[:boo] would be "octopus".
In HTTP/HTML, the params are really just a series of key-value pairs where the key and the value are strings, but Ruby on Rails has a special syntax for making the params be a hash with hashes inside. For example, if the user's browser requested
http://w...