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Django CharField vs TextField
... nit: the Django docs recommend: Avoid using null on string-based fields such as CharField and TextField: docs.djangoproject.com/en/2.0/ref/models/fields/#null so it's best to keep null=False.
– modulitos
Jan 15 '19 at 22:27
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Binding a WPF ComboBox to a custom list
...these problems.
Edit2 (.NET 4.5): The content of the DropDownList can be based on ToString() and not of DisplayMemberPath, while DisplayMemberPath specifies the member for the selected and displayed item only.
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How exactly does a generator comprehension work?
...narios where you need to take one item at a time, do a lot of calculations based on that item, and then move on to the next item. If you need more than one value, you can also use a generator expression and grab a few at a time. If you need all the values before your program proceeds, use a list com...
Detect encoding and make everything UTF-8
...ng out lots of texts from various RSS feeds and inserting them into my database.
24 Answers
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“Large data” work flows using pandas
...l of the fields in each file?
Do you ever select subsets of rows (records) based on criteria (e.g. select the rows with field A > 5)? and then do something, or do you just select fields A, B, C with all of the records (and then do something)?
Do you 'work on' all of your columns (in groups), or a...
PreparedStatement IN clause alternatives?
...g any(String sql, final int params) {
// Create a comma-delimited list based on the number of parameters.
final StringBuilder sb = new StringBuilder(
new String(new char[params]).replace("\0", "?,")
);
// Remove trailing comma.
sb.setLength(Math.max(sb.length() - 1, ...
Difference between class and type
...ere type erasure is not in effect,
like when traversing parameter types or base types.
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Is is possible to check if an object is already attached to a data context in Entity Framework?
...ties refer to the same entity. I haven't figure out how to only attach the base entity, so I had to redesign the project a bit, to use separate contexts for each "business transaction", like it was designed for. I'll note this for future projects.
– Aske B.
Jan...
How does the main() method work in C?
...ents.
The leftmost arguments are closer to the top of the stack, or to the base of the stack frame, so that spurious arguments do not invalidate the addressing.
One set of calling conventions which obeys these rules is stack-based parameter passing whereby the caller pops the arguments, and they a...
How to return an array from JNI to Java?
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Based on the asked question, this is already explained in the first answer that how can we pass int[] via jobjectArray. But Here is an example how we can return a jobjectArray which contains lists of data. This can be helpful...