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Ruby: Merging variables in to a string
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The idiomatic way is to write something like this:
"The #{animal} #{action} the #{second_animal}"
Note the double quotes (") surrounding the string: this is the trigger for Ruby to use its built-in placeholder substitution. You cannot repla...
How to avoid “Permission denied” when using pip with virtualenv
...h pip in a virtual environment on an Ubuntu machine, but encounter a permission-related issue. For example:
8 Answers
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python dataframe pandas drop column using int
I understand that to drop a column you use df.drop('column name', axis=1). Is there a way to drop a column using a numerical index instead of the column name?
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What is mattr_accessor in a Rails module?
I couldn't really find this in Rails documentation but it seems like 'mattr_accessor' is the Module corollary for 'attr_accessor' (getter & setter) in a normal Ruby class .
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Splitting a Java String by the pipe symbol using split(“|”)
...u need
test.split("\\|");
split uses regular expression and in regex | is a metacharacter representing the OR operator. You need to escape that character using \ (written in String as "\\" since \ is also a metacharacter in String literals and require another \ to escape it).
You can also use
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How to get JSON from webpage into Python script
...ort urllib.request, json
with urllib.request.urlopen("http://maps.googleapis.com/maps/api/geocode/json?address=google") as url:
data = json.loads(url.read().decode())
print(data)
Python2 example:
import urllib, json
url = "http://maps.googleapis.com/maps/api/geocode/json?address=google"
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How to undo the effect of “set -e” which makes bash exit immediately if any command fails?
...will exit immediately if any command exits with non-zero. How can I undo this effect?
3 Answers
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Scaling Node.js
...red. After that you should do load balancing like you are mentioning which is almost the same for every architecture(like you are saying you could start multiple node processes first. But when you get really big you need more boxes).
Nginx load balancing example:
http {
upstream myproject {
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Undo scaffolding in Rails
Is there any way to 'undo' the effects of a scaffold command in Rails?
24 Answers
24
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Checking oracle sid and database name
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edited Feb 20 at 6:39
Stefan van den Akker
5,31577...