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How to pass a user defined argument in scrapy spider
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190
Spider arguments are passed in the crawl command using the -a option. For example:
scrapy crawl...
Rails: how do I validate that something is a boolean?
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Luca Spiller
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answered Jan 18 '11 at 7:38
Drew Dara-AbramsDre...
Get the client's IP address in socket.io
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Okay, as of 0.7.7 this is available, but not in the manner that lubar describes. I ended up needing to parse through some commit logs on git hub to figure this one out, but the following code does actually work for me now:
var io = requ...
get list of pandas dataframe columns based on data type
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320
If you want a list of columns of a certain type, you can use groupby:
>>> df = pd.Data...
mysql - how many columns is too many?
I'm setting up a table that might have upwards of 70 columns. I'm now thinking about splitting it up as some of the data in the columns won't be needed every time the table is accessed. Then again, if I do this I'm left with having to use joins.
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JavaScript % (modulo) gives a negative result for negative numbers
...rs♦
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answered Dec 17 '10 at 3:59
EnriqueEnrique
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async await return Task
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edited Oct 20 '15 at 19:52
bashis
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ans...
.htaccess mod_rewrite - how to exclude directory from rewrite rule
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answered Dec 4 '09 at 17:51
GumboGumbo
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How to change time in DateTime?
...the DateTime.Date property:
DateTime s = ...;
TimeSpan ts = new TimeSpan(10, 30, 0);
s = s.Date + ts;
s will now be the same date, but at 10.30am.
Note that DateTime disregards daylight saving time transitions, representing "naive" Gregorian time in both directions (see Remarks section in the Da...
libevent+protobuf轻松搭建tcpserver - C/C++ - 清泛网 - 专注C/C++及内核技术
...();
init_server(port, params…);
event_dispatch();
return 0;
}
int init_server(short port, params…)
{
int listen_fd = setup_tcp_server(port);
set_non_block(listen_fd);
// 将输入的参数params… 组织为一个结构，以指针的方式存于accept_param
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