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SQLAlchemy IN clause
...rnative way is using raw SQL mode with SQLAlchemy, I use SQLAlchemy 0.9.8, python 2.7, MySQL 5.X, and MySQL-Python as connector, in this case, a tuple is needed. My code listed below:
id_list = [1, 2, 3, 4, 5] # in most case we have an integer list or set
s = text('SELECT id, content FROM myTable W...
How to prevent errno 32 broken pipe?
Currently I am using an app built in python. When I run it in personal computer, it works without problems.
4 Answers
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An efficient way to transpose a file in Bash
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A Python solution:
python -c "import sys; print('\n'.join(' '.join(c) for c in zip(*(l.split() for l in sys.stdin.readlines() if l.strip()))))" < input > output
The above is based on the following:
import sys
for c i...
How do I perform the SQL Join equivalent in MongoDB?
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$unwind - because data is denormalised correctly, else wrapped in arrays
Python code..
db.LeftTable.aggregate([
# connect all tables
{"$lookup": {
"from": "RightTable",
"localField": "ID",
...
How can I access Google Sheet spreadsheets only with Javascript?
...recipes" (JSON payloads) for core API requests
If you're not "allergic" to Python (if you are, just pretend it's pseudocode ;) ), I made several videos with more "real-world" samples of using the API you can learn from and migrate to JS if desired (NOTE: even though it's Python code, most API reques...
How do you log server errors on django sites
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Note that using logging.exception('Some message') with python's standard logging module works just fine in a sginal handler for got_request_exception, if all you are looking to do is log out stack traces. In other words, the traceback is still available in got_request_exception....
Java 8 Stream and operation on arrays
I have just discovered the new Java 8 stream capabilities. Coming from Python, I was wondering if there was now a neat way to do operations on arrays like summing, multiplying two arrays in a "one line pythonic" way ?
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Iterate over model instance field names and values in template
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You can use Django's to-python queryset serializer.
Just put the following code in your view:
from django.core import serializers
data = serializers.serialize( "python", SomeModel.objects.all() )
And then in the template:
{% for instance in dat...
How do I set the value property in AngularJS' ng-options?
...easiest or beautiful syntax. This syntax is kind of an extended version of Python's list comprehensions and knowing that helps me to remember the syntax very easily. It's something like this:
Python code:
my_list = [x**2 for x in [1, 2, 3, 4, 5]]
> [1, 4, 9, 16, 25]
# Let people to be a list o...
How can I map True/False to 1/0 in a Pandas DataFrame?
I have a column in python pandas DataFrame that has boolean True/False values, but for further calculations I need 1/0 representation. Is there a quick pandas/numpy way to do that?
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