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Set Django IntegerField by choices=… name
...rgs):
if not hasattr(choices[0],'__iter__'):
choices = zip(range(len(choices)), choices)
self.val2choice = dict(choices)
self.choice2val = dict((v,k) for k,v in choices)
kwargs['choices'] = choices
super(models.IntegerField, self).__init__(**kwar...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...is what gets passed to sample.
这个例子中，with后面的get_sample()变成了Sample()。这没有任何关系，只要紧跟with后面的语句所返回的对象有__enter__()和__exit__()方法即可。此例中，Sample()的__enter__()方法返回新创建的Sample对象，并赋值给变...
Check if two unordered lists are equal [duplicate]
...e number of matching elements (it considers the order).
sum([1 for i,j in zip(a,b) if i==j])
Therefore,
len(a)==len(b) and len(a)==sum([1 for i,j in zip(a,b) if i==j])
will be True if both lists are the same, contain the same elements and in the same order. False otherwise.
So, you can defin...
Getting number of elements in an iterator in Python
...ber of items.
"""
counter = itertools.count()
deque(itertools.izip(iterable, counter), maxlen=0) # (consume at C speed)
return next(counter)
(For Python 3.x replace itertools.izip with zip).
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Can I get Memcached running on a Windows (x64) 64bit environment?
...
http://s3.amazonaws.com/downloads.northscale.com/memcached-win32-1.4.4-14.zip
64-bit binary of memcached 1.4.4 as Windows-service:
http://blog.couchbase.com/memcached-windows-64-bit-pre-release-available
http://s3.amazonaws.com/downloads.northscale.com/memcached-win64-1.4.4-14.zip
The 64-bit ve...
android studio 0.4.2: Gradle project sync failed error
...
distributionUrl=http\://services.gradle.org/distributions/gradle-1.9-all.zip
After open your project in Android Studio and select the build.gradle file in the /src directory and edit it to this :
dependencies {
classpath 'com.android.tools.build:gradle:0.7.+'
}
After fixing it lik...
Azure SQL Database Bacpac Local Restore
...myself), when you export a .bacpac from Azure, it will be downloaded as a .zip file, not a .bacpac file, and the file dialog that is opened by the Browse button in the import wizard will only show either *.bacpac or . in the file filters, implying that .zip is not supported. However, if you change t...
How do I programmatically determine operating system in Java?
..."nix") || operSys.contains("nux")
|| operSys.contains("aix")) {
os = OS.LINUX;
} else if (operSys.contains("mac")) {
os = OS.MAC;
} else if (operSys.contains("sunos")) {
os = OS.SOLARIS;
}
...
How to create a video from images with FFmpeg?
...M4
These are the test media I've used:a
wget -O opengl-rotating-triangle.zip https://github.com/cirosantilli/media/blob/master/opengl-rotating-triangle.zip?raw=true
unzip opengl-rotating-triangle.zip
cd opengl-rotating-triangle
wget -O audio.ogg https://upload.wikimedia.org/wikipedia/commons/7/74/...
How do you rotate a two dimensional array?
...
TL;DR: list(zip(*reversed(your_list_of_lists)))
– Boris
Dec 28 '19 at 7:34
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