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Combine two data frames by rows (rbind) when they have different sets of columns
... 10 <NA>
2.1 11 16 A
2.2 12 17 B
2.3 13 18 C
2.4 14 19 D
2.5 15 20 E
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add created_at and updated_at fields to mongoose schemas
...s from external system, then check Roman Rhrn Nesterov's answer.
UPDATE: (2.5 years later)
You can now use the #timestamps option with mongoose version >= 4.0.
let ItemSchema = new Schema({
name: { type: String, required: true, trim: true }
},
{
timestamps: true
});
If set timestamps, mo...
Which is faster in Python: x**.5 or math.sqrt(x)?
... Here are the results of your script: zoltan@host:~$ python2.5 p.py Took 0.183226 seconds Took 0.155829 seconds zoltan@host:~$ python2.4 p.py Took 0.181142 seconds Took 0.153742 seconds zoltan@host:~$ python2.6 p.py Took 0.157436 seconds Took 0.093905 seconds Target system: Ubunt...
Python loop that also accesses previous and next values
...
using conditional expressions for conciseness for python >= 2.5
def prenext(l,v) :
i=l.index(v)
return l[i-1] if i>0 else None,l[i+1] if i<len(l)-1 else None
# example
x=range(10)
prenext(x,3)
>>> (2,4)
prenext(x,0)
>>> (None,2)
prenext(x,9)
>>&...
Java NIO FileChannel versus FileOutputstream performance / usefulness
...system, a system under load, gathered in logs. Not my notebook's 7200 RPM 2.5" SATA drive while I watched intensely as the JVM work my hard disc.
What are you running on? It matters.
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String formatting: % vs. .format vs. string literal
...wing about it (me before reading this)
having to be compatible with Python 2.5
To answer your second question, string formatting happens at the same time as any other operation - when the string formatting expression is evaluated. And Python, not being a lazy language, evaluates expressions befo...
How to assign the output of a command to a Makefile variable
...nally, only if the Python installed is greater than a certain version (say 2.5).
7 Answers
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How can I determine if a .NET assembly was built for x86 or x64?
...oft Corporation. All rights reserved.
Version : v2.0.50727
CLR Header: 2.5
PE : PE32
CorFlags : 3
ILONLY : 1
32BIT : 1
Signed : 0
As per comments the flags above are to be read as following:
Any CPU: PE = PE32 and 32BIT = 0
x86: PE = PE32 and 32BIT = 1
64-bit: PE = PE32+ an...
How to check if there exists a process with a given pid in Python?
...chitectures, with Python versions from 2.6 to 3.4 (users of Python 2.4 and 2.5 may use 2.1.3 version). PyPy is also known to work.
It has a function called pid_exists() that you can use to check whether a process with the given pid exists.
Here's an example:
import psutil
pid = 12345
if psutil.p...
NoSQL - MongoDB vs CouchDB [closed]
...on
Journaling
Powerful aggregation framework
On 32bit systems, limited to ~2.5Gb
Text search integrated
GridFS to store big data + metadata (not actually an FS)
Data center aware
Best used: If you need dynamic queries. If you prefer to define indexes, not map/reduce functions. If you need good per...