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Split by comma and strip whitespace in Python
...of the blank list entries. > text = [x.strip() for x in text.split('.') if x != '']
– RandallShanePhD
Jul 28 '17 at 19:41
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How do I filter ForeignKey choices in a Django ModelForm?
...et to the field's queryset attribute. Depends on how your form is built. If you build an explicit form, you'll have fields named directly.
form.rate.queryset = Rate.objects.filter(company_id=the_company.id)
If you take the default ModelForm object, form.fields["rate"].queryset = ...
This is d...
Reading/parsing Excel (xls) files with Python
... strings = [el.text for e, el in iterparse(z.open('xl/sharedStrings.xml')) if el.tag.endswith('}t')]
rows = []
row = {}
value = ''
for e, el in iterparse(z.open('xl/worksheets/sheet1.xml')):
if el.tag.endswith('}v'): # Example: <v>84</v> ...
How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?
How can I tell if the JVM in which my application runs is 32 bit or 64-bit? Specifically, what functions or properties I can used to detect this within the program?
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How to append text to an existing file in Java?
...
Are you doing this for logging purposes? If so there are several libraries for this. Two of the most popular are Log4j and Logback.
Java 7+
If you just need to do this one time, the Files class makes this easy:
try {
Files.write(Paths.get("myfile.txt"), "the ...
When do you use POST and when do you use GET?
... idempotent requests
In details
There is a proper place for each. Even if you don't follow RESTful principles, a lot can be gained from learning about REST and how a resource oriented approach works.
A RESTful application will use GETs for operations which are both safe and idempotent.
A...
Check if a variable is a string in JavaScript
...// displays "object"
Example from this webpage. (Example was slightly modified though).
This won't work as expected in the case of strings created with new String(), but this is seldom used and recommended against[1][2]. See the other answers for how to handle these, if you so desire.
The Goo...
Why is extending native objects a bad practice?
... that this kind of stuff causes all kinds of terrible bugs in javascript.
If you need custom behaviour, it is far better to define your own class (perhaps a subclass) instead of changing a native one. That way you will not break anything at all.
The ability to change how a class works without subc...
Am I immoral for using a variable name that differs from its type only by case?
... It is the simplest, expressive way to name a single variable of a type. If you needed two Person objects then you could prefix person with meaningful adjectives like
fastPerson
slowPerson
otherwise just
person
is fine with me.
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When to use Preorder, Postorder, and Inorder Binary Search Tree Traversal strategies
I realized recently that while having used BST's plenty in my life, I've never even contemplated using anything but Inorder traversal (while I am aware of and know how easy it is to adapt a program to use pre/post-order traversal).
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