大约有 47,000 项符合查询结果（耗时：0.0634秒） [XML]
Rails: fields_for with index?
... many years ago, for a modern approach see:
https://stackoverflow.com/a/22640703/105403
This would actually be a better approach, following Rails documentation more closely:
<% @questions.each.with_index do |question,index| %>
<% f.fields_for :questions, question do |fq| %>
...
What is the difference between map and flatMap and a good use case for each?
... values from those that return a Some:
val rdd = sc.parallelize(Seq(1,2,3,4))
def myfn(x: Int): Option[Int] = if (x <= 2) Some(x * 10) else None
rdd.flatMap(myfn).collect
res3: Array[Int] = Array(10,20)
(noting here that an Option behaves rather like a list that has either one element, ...
Site stopped working in asp.net System.Web.WebPages.Razor.Configuration.HostSection cannot be cast t
...y name="System.Web.WebPages.Razor"
publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856a...
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb
... Ron ERon E
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Two versions of python on linux. how to make 2.7 the default
... |
edited Oct 8 '13 at 19:47
answered Oct 8 '13 at 19:17
ab...
How to delete items from a dictionary while iterating over it?
...over it:
>>> mydict = {'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> for k, v in mydict.iteritems():
... if k == 'two':
... del mydict[k]
...
------------------------------------------------------------
Traceback (most recent call last):
File "<ipython console>...
How do I keep Python print from adding newlines or spaces? [duplicate]
...59
Boris
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answered Oct 31 '08 at 22:35
Greg HewgillGreg...
Android: Expand/collapse animation
...
744
I see that this question became popular so I post my actual solution. The main advantage is tha...
Why is argc not a constant?
...
114
In this case, history is a factor. C defined these inputs as "not constant", and compatibility ...
Why wasn't PyPy included in standard Python?
... |
edited Apr 17 '15 at 4:38
answered Oct 12 '12 at 21:35
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