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Delete a key from a MongoDB document using Mongoose
...rs. So you can do the action in question by this:
User.collection.update({_id: user._id}, {$unset: {field: 1 }});
Since version 2.0 you can do:
User.update({_id: user._id}, {$unset: {field: 1 }}, callback);
And since version 2.4, if you have an instance of a model already you can do:
doc.fiel...
Python: Using .format() on a Unicode-escaped string
... @Kit: If you want all literals to be Unicode (like in Python 3), put from __future__ import unicode_literals at the beginning of your source files.
– Philipp
Jul 13 '10 at 8:47
1
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Javascript: Round up to the next multiple of 5
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const fn = _num =>{
return Math.round(_num)+ (5 -(Math.round(_num)%5))
}
reason for using round is that expected input can be a random number.
Thanks!!!
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How to convert SQL Query result to PANDAS Data Structure?
...r. 2015
As noted below, pandas now uses SQLAlchemy to both read from (read_sql) and insert into (to_sql) a database. The following should work
import pandas as pd
df = pd.read_sql(sql, cnxn)
Previous answer:
Via mikebmassey from a similar question
import pyodbc
import pandas.io.sql as psql
cn...
Get element inside element by class and ID - JavaScript
...
@Ӫ_._Ӫ ... lol...your correct but you just prove my answer even more. You cannot rely on getElementsByClassName if your page needs to function across multiple browsers. jQuery would definately be an option but so whould the ...
Where is Maven' settings.xml located on mac os?
...8:00)
Maven home: /usr/local/Cellar/maven/3.5.0/libexec
Java version: 1.8.0_121, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre
Default locale: zh_CN, platform encoding: UTF-8
OS name: "mac os x", version: "10.11.5", arch: "x86_64", family:...
What is the purpose of using -pedantic in GCC/G++ compiler?
...s OK when I re-enable it (the one program that didn't was explicitly using __int128 types, which are pedantically incorrect). I think there was an intervening stage when GCC was too noisy (for my liking) with -pedantic. I just tested about 300 source files — some library code, some commands, som...
How to change the background color of the options menu?
...">
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<item name="android:itemBackground">@color/overflow_background</item>
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</style>
Tested from API 4.2 to 5.0.
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How to check if a python module exists without importing it
...mport can find something in python2, using imp
import imp
try:
imp.find_module('eggs')
found = True
except ImportError:
found = False
To find dotted imports, you need to do more:
import imp
try:
spam_info = imp.find_module('spam')
spam = imp.load_module('spam', *spam_info)
i...
What's the difference between dynamic (C# 4) and var?
... {
[CompilerGenerated]
private static class <Main>o__SiteContainer0
{
public static CallSite<Action<CallSite, object>> <>p__Site1;
}
private static void Main(string[] args)
{
Junk a = new Junk(); /...