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Best way to find the intersection of multiple sets?
... use multiple arguments to set.intersection(), like
u = set.intersection(s1, s2, s3)
If the sets are in a list, this translates to:
u = set.intersection(*setlist)
where *a_list is list expansion
Note that set.intersection is not a static method, but this uses the functional notation to apply ...
How to create an object for a Django model with a many to many field?
...is:
sample_object = Sample()
sample_object.save()
sample_object.users.add(1,2)
Update: After reading the saverio's answer, I decided to investigate the issue a bit more in depth. Here are my findings.
This was my original suggestion. It works, but isn't optimal. (Note: I'm using Bars and a Foo i...
Global access to Rake DSL methods is deprecated
...may see something like
rake aborted!
You have already activated Rake 0.9.1 ...
I still had a copy of Rake 0.9.1 in my directory so I deleted it.
You can "delete" Rake 0.9.1 by running the following command:
gem uninstall rake -v=0.9.1
If you have multiple versions of the gem installed, you'...
How can I list (ls) the 5 last modified files in a directory?
...y using head or tail. If you want the 5 most-recently modified files:
ls -1t | head -5
The -1 (that's a one) says one file per line and the head says take the first 5 entries.
If you want the last 5 try
ls -1t | tail -5
...
Append a NumPy array to a NumPy array
...
In [1]: import numpy as np
In [2]: a = np.array([[1, 2, 3], [4, 5, 6]])
In [3]: b = np.array([[9, 8, 7], [6, 5, 4]])
In [4]: np.concatenate((a, b))
Out[4]:
array([[1, 2, 3],
[4, 5, 6],
[9, 8, 7],
[6, 5, 4...
Creating range in JavaScript - strange syntax
...
+1000
Understanding this "hack" requires understanding several things:
Why we don't just do Array(5).map(...)
How Function.prototype.ap...
Process all arguments except the first one (in a bash script)
...
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edited May 23 '17 at 10:31
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answered Jan 29 '12 at 22:32
...
Regex to match a digit two or four times
...
145
There's no specific syntax for that, but there are lots of ways to do it:
(?:\d{4}|\d{2}) ...
How can I make pandas dataframe column headers all lowercase?
...
180
You can do it like this:
data.columns = map(str.lower, data.columns)
or
data.columns = [x....
How do you get the magnitude of a vector in Numpy?
... only one obvious way to do it", how do you get the magnitude of a vector (1D array) in Numpy?
6 Answers
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