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How to remove array element in mongodb?
... will find document with the given _id and remove the phone +1786543589455 from its contact.phone array.
You can use $unset to unset the value in the array (set it to null), but not to remove it completely.
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Docker: adding a file from a parent directory
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You can build the Dockerfile from the parent directory:
docker build -t <some tag> -f <dir/dir/Dockerfile> .
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How to convert a string to utf-8 in Python
...r which sends utf-8 characters to my Python server, but when I retrieve it from the query string, the encoding that Python returns is ASCII. How can I convert the plain string to utf-8?
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SHA-1 fingerprint of keystore certificate
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how to get release sha1. I am getting it from my app.jks but console.google is showing its already used.
– عثمان غني
Jul 6 '16 at 10:26
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How do I keep track of pip-installed packages in an Anaconda (Conda) environment?
...ronment. I can use the standard conda install... command to put packages from the distribution into my environments, but to use anything outside (i.e. Flask-WTF, flask-sqlalchemy, and alembic) I need to use pip install in the active environment. However, when I look at the contents of the enviro...
What happens to a declared, uninitialized variable in C? Does it have a value?
...in a debugger - but strictly speaking, the compiler is free to do anything from crashing to summoning demons through your nasal passages.
As for why it's undefined behavior instead of simply "undefined/arbitrary value", there are a number of CPU architectures that have additional flag bits in their ...
Use of def, val, and var in scala
...6
scala> aVariable = 5
aVariable: Int = 5
According to above, labels from def and val cannot be reassigned, and in case of any attempt an error like the below one will be raised:
scala> something = 5 * 6
<console>:8: error: value something_= is not a member of object $iw
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Serving static files with Sinatra
...oin(settings.public_folder, 'index.html')
end
This will serve index.html from whatever directory has been configured as having your application's static files.
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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...ision results, double-precision suffices for a gold standard — the error from aaaaaa computed in double is *vastly smaller than the error of any of the single-precision computations.
– Stephen Canon
Sep 24 '13 at 22:47
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Can someone explain in simple terms to me what a directed acyclic graph is?
...you can never go to the same bar twice". Although the family-tree example from another answer is probably conceptually simpler, especially for those of us who aren't college students or alcoholics.
– Tom Harrison
Jul 23 '16 at 16:48
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