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Mapping over values in a python dictionary
Given a dictionary { k1: v1, k2: v2 ... } I want to get { k1: f(v1), k2: f(v2) ... } provided I pass a function f .
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What's the best way to check if a file exists in C?
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Look up the access() function, found in unistd.h. You can replace your function with
if( acces...
How to set selected item of Spinner by value, not by position?
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edited Jan 4 '18 at 12:43
Kunwar Ajeet Singh Rajput
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an...
Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...rong host. Is that the right host you are trying to log in to?
Note that 1. will also happen if you have messed up the /home/<username>/.ssh/authorized_keys file on your EC2 instance.
About 2., the information about which username you should use is often lacking from the AMI Image descript...
How to remove from a map while iterating it?
... (must_delete)
{
m.erase(it++); // or "it = m.erase(it)" since C++11
}
else
{
++it;
}
}
Note that we really want an ordinary for loop here, since we are modifying the container itself. The range-based loop should be strictly reserved for situations where we only care about the...
Problems with contenttypes when loading a fixture in Django
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What is the difference between substr and substring?
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10 Answers
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Exception thrown in NSOrderedSet generated accessors
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answered Sep 13 '11 at 0:24
TechZenTechZen
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are there dictionaries in javascript like python?
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131
This is an old post, but I thought I should provide an illustrated answer anyway.
Use javascr...
MongoDB与内存 - 大数据 & AI - 清泛网移动版 - 专注IT技能提升
...务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
VIRT RES SHR %MEM
1892g 21g 21g 69.6
这台MongoDB服务器有没有性能问题...