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How do you query for “is not null” in Mongo?
...n empty string which means "", it will be returned.It is the same behavior for
db.collection_name.find({"filed_name":{$ne:null}});
Extra validation:
Okay, so we are not finished yet we need an extra condition.
db.collection_name.
find({ "field_name":{$type:2},$where:"this.field_name.length >...
Python error “ImportError: No module named”
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For me the issue was I was using python driver.py when I should have been using python3 driver.py since I installed with pip3.
– Eric Wiener
Mar 17 '19 at 20:26
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Generic deep diff between two objects
... can be further enhanced to take function as argument that will be used to format diff object in arbitrary way based on passed primitive values (now this job is done by "compareValues" method).
var deepDiffMapper = function () {
return {
VALUE_CREATED: 'created',
VALUE_UPDATED: 'update...
Basic http file downloading and saving to disk in python?
I'm new to Python and I've been going through the Q&A on this site, for an answer to my question. However, I'm a beginner and I find it difficult to understand some of the solutions. I need a very basic solution.
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pandas dataframe columns scaling with sklearn
...min_max_scaler to some of the columns. Ideally, I'd like to do these transformations in place, but haven't figured out a way to do that yet. I've written the following code that works:
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Why do we use __init__ in Python classes?
...tions) available to the object.
However, notice that you don't set colour for the doghood itself - it's an abstract concept. There are attributes that make sense on classes. For instance, population_size is one such - it doesn't make sense to count the Fido because Fido is always one. It does make ...
Can Python print a function definition?
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That seems to be what I was looking for. Thanks!
– Eddie Welker
Oct 14 '09 at 13:18
9
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Mongoose populate after save
...r field on a newly saved object ... the only way I can find is to re-query for the objects I already have which I would hate to do.
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get and set in TypeScript
I'm trying to create get and set method for a property:
9 Answers
9
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Python extract pattern matches
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You need to capture from regex. search for the pattern, if found, retrieve the string using group(index). Assuming valid checks are performed:
>>> p = re.compile("name (.*) is valid")
>>> result = p.search(s)
>>> result
<_sre.SRE_Matc...