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In Jinja2, how do you test if a variable is undefined?
Converting from Django, I'm used to doing something like this:
6 Answers
6
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How do I update each dependency in package.json to the latest version?
... dependencies to their latest versions since this is a fresh project and I don't mind fixing something if it breaks.
32 Ans...
How to call a Python function from Node.js
... use "child_process" package which comes packaged with node.
Then you can do something like:
const spawn = require("child_process").spawn;
const pythonProcess = spawn('python',["path/to/script.py", arg1, arg2, ...]);
Then all you have to do is make sure that you import sys in your python script,...
Split string into an array in Bash
...${array[0]}"
To iterate over the elements:
for element in "${array[@]}"
do
echo "$element"
done
To get both the index and the value:
for index in "${!array[@]}"
do
echo "$index ${array[index]}"
done
The last example is useful because Bash arrays are sparse. In other words, you can de...
Multiple file-extensions searchPattern for System.IO.Directory.GetFiles
...
This is a very insufficient way of doing it, since you will loop entire directory for each filter. Instead you should check for each file if it has the filter then add to do the list. You can use the answer explained in this thread: stackoverflow.com/questions...
What are the most common SQL anti-patterns? [closed]
...r are learning) that SQL is different. Eliciting the desired results, and doing so efficiently, involves a tedious process partly characterized by learning unfamiliar paradigms, and finding out that some of our most familiar programming patterns don't work here. What are the common antipatterns yo...
When can I use a forward declaration?
I am looking for the definition of when I am allowed to do forward declaration of a class in another class's header file:
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java.lang.IllegalArgumentException: View not attached to window manager
... solution? Yes. Effective? Perhaps in this case. Would I recommend it? NO! Don't swallow ALL exceptions like that! I would not even catch the IllegalArgumentException, but look for another solution.
– Simon Forsberg
Jan 25 '13 at 11:11
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Ruby - elegantly convert variable to an array if not an array already
...n many years of Ruby i had never come across this type of invocation. What do parentheses on a class name do? I can't find this in docs.
– mastaBlasta
Oct 27 '15 at 21:08
1
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UIView with rounded corners and drop shadow?
...d a simple design request: Round the corners on a UIView and add a drop shadow.To do as given below.
33 Answers
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