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Create dynamic URLs in Flask with url_for()
...Just so that it is clearer, if you have @app.route("/<a>/<b>") and def function(a,b): ... as its function, then you should use url_for and specify its keyword arguments like this: url_for('function', a='somevalue', b='anothervalue')
– jarrettyeo
May...
How can I modify the size of column in a MySQL table?
...o large even if it's the only column in that table, so MySQL automatically converts it to a MEDIUMTEXT data type.
mysql> create table foo (str varchar(300));
mysql> alter table foo modify str varchar(65536);
mysql> show create table foo;
CREATE TABLE `foo` (
`str` mediumtext
) ENGINE=MyI...
How to find gaps in sequential numbering in mysql?
... far faster than the accepted answer. The only thing that I'd add is that CONVERT( YourCol, UNSIGNED ) will give better results if YourCol isn't already an integer.
– Barton Chittenden
Feb 10 '17 at 23:36
...
Fetch first element which matches criteria
...row the NPE. To prevent that from happening, use orElse() instead of get() and provide a fallback object (like orElse(new Station("dummy", -1)), or store the result of findFirst() in a variable and check it with isEmpty() before calling get()
– ifloop
Jan 24 '1...
Doctrine and composite unique keys
...ote that you have to provide column names, not field names. So you have to convert camelCase to snake_case and append _id for associations, because that's how Doctrine generates column names.
– gronostaj
Mar 6 '18 at 13:35
...
Replace None with NaN in pandas dataframe
...ata from an SQL database, you can combine this with the answer below. This converts None (which isn't a string) to NaN. Then you can df['column'].replace(nan, "", inplace=True) if say you wanted None to be empty string.
– VISQL
Jul 4 '18 at 12:52
...
Why is __init__() always called after __new__()?
I'm just trying to streamline one of my classes and have introduced some functionality in the same style as the flyweight design pattern .
...
Avoiding SQL injection without parameters
...weird. The parser is capable of identifying constants in the text and can convert the SQL string to one the uses parameters artificially. It can then insert into the cache the text of this new parameterised query. Subsequent similar SQL may find its parameterised version matched in the cache. Ho...
How to add reference to a method parameter in javadoc?
...;/code>
* argument is the index of the first character of the subarray and
* the <code>count</code> argument specifies the length of the
* subarray. The contents of the subarray are copied; subsequent
* modification of the character array does not affect the newly
* created strin...
Does JSON syntax allow duplicate keys in an object?
...<a>x</a>
<a>y</a>
</object>
When this is converted into JSON, you get the following:
{
"object": {
"a": [
"x",
"y"
]
}
}
A natural mapping from a language that handles what you might call duplicate keys to another, can serve as a potential...