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How to pull a random record using Django's ORM?
...['count']
random_index = randint(0, count - 1)
return self.all()[random_index]
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Cosine Similarity between 2 Number Lists
... scientific routines for example, "routines for computing integrals numerically, solving differential equations, optimization, and sparse matrices." It uses the superfast optimized NumPy for its number crunching. See here for installing.
Note that spatial.distance.cosine computes the distance, and ...
Getting the caller function name inside another function in Python? [duplicate]
...on 2 each frame record is a list. The third element in each record is the caller name. What you want is this:
>>> import inspect
>>> def f():
... print inspect.stack()[1][3]
...
>>> def g():
... f()
...
>>> g()
g
For Python 3.5+, each frame record i...
小心！创业者不可不知的互联网家装惊天伪命题 - 资讯 - 清泛网 - 专注C/C++...
...用到装修现场，并通过云端处理系统进行传输，再加上与APP进行实时互联，用户只要通过APP便能够实时监控到整个装修过程，对于家装过程中出现的问题，用户没有必要前往装修现场，便能够完成对整个装修过程的控制……改变...
Naming returned columns in Pandas aggregate function? [duplicate]
...er, this does not work with lambda functions, since they are anonymous and all return <lambda>, which causes a name collision:
>>> df.groupby('A').agg({'B': [lambda x: x.min(), lambda x: x.max]})
SpecificationError: Function names must be unique, found multiple named <lambda>
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Calculating a directory's size using Python?
...
This walks all sub-directories; summing file sizes:
import os
def get_size(start_path = '.'):
total_size = 0
for dirpath, dirnames, filenames in os.walk(start_path):
for f in filenames:
fp = os.path.join(di...
Cocoa: What's the difference between the frame and the bounds?
UIView and its subclasses all have the properties frame and bounds . What's the difference?
12 Answers
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How to save an HTML5 Canvas as an image on a server?
I'm working on a generative art project where I would like to allow users to save the resulting images from an algorithm. The general idea is:
...
How to master AngularJS? [closed]
...The hitchhiker's guide to the directive
Project structure - Check out this app
Angular-UI - Must use components for any UI development
UI-Bootstrap - From-scratch JS re-implementations of bootstrap
components as AngularJS directives
Full-Spectrum Testing with AngularJS and Karma
Bonus - Data binding...
How to avoid annoying error “declared and not used”
...s it easier to read code written by other people (you are always sure that all declared variables will be used), and avoid some possible dead code.
But, if you really want to skip this error, you can use the blank identifier (_) :
package main
import (
"fmt" // imported and not used: "fmt"
)
...