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How to solve error “Missing `secret_key_base` for 'production' environment” (Rails 4.1)
... error you should follow these steps to create an environment variable for Linux (in my case Ubuntu) in your production server:
In the terminal of your production server execute:
$ RAILS_ENV=production rake secret
This returns a large string with letters and numbers. Copy that, which we will re...
Cosine Similarity between 2 Number Lists
...th vectors (more of a matrix transpose, actually) just to get the data in "Pythonic" order. It would be interesting to time the nuts-and-bolts implementation:
import math
def cosine_similarity(v1,v2):
"compute cosine similarity of v1 to v2: (v1 dot v2)/{||v1||*||v2||)"
sumxx, sumxy, sumyy ...
Get column index from column name in python pandas
In R when you need to retrieve a column index based on the name of the column you could do
7 Answers
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How do I get a list of all the duplicate items using pandas in python?
I have a list of items that likely has some export issues. I would like to get a list of the duplicate items so I can manually compare them. When I try to use pandas duplicated method , it only returns the first duplicate. Is there a a way to get all of the duplicates and not just the first one?...
How to validate an email address using a regular expression?
...ex library used e.g. in PHP) can correctly parse RFC 5322 without a hitch. Python and C# can do that too, but they use a different syntax from those first two. However, if you are forced to use one of the many less powerful pattern-matching languages, then it’s best to use a real parser.
It's als...
Python Pandas Error tokenizing data
I'm trying to use pandas to manipulate a .csv file but I get this error:
39 Answers
39...
Python call function within class
....new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f5615648%2fpython-call-function-within-class%23new-answer', 'question_page');
}
);
Post as a guest
...
String literals: Where do they go?
... Flags Align
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x0000000000000000 0x0000000000400000 0x0000000000400000
0x0000000000000704 0x0000000000000704 R E 200000
Section to Segment mapping:
Segment Sections...
02 ...
Why do we need the “finally” clause in Python?
I am not sure why we need finally in try...except...finally statements. In my opinion, this code block
14 Answers
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Sending email with PHP from an SMTP server
...n Windows 7 x64.
mail() uses SMTP server on remote or virtual machine with Linux. Of course, real mail service like Gmail doesn't allow direct connection without any credentials or keys. You can set up virtual machine or use one located in your LAN. Most linux distros have mail server out of the box...