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How do I fix "The expression of type List needs unchecked conversion…'?
...common problem when dealing with pre-Java 5 APIs. To automate the solution from erickson, you can create the following generic method:
public static <T> List<T> castList(Class<? extends T> clazz, Collection<?> c) {
List<T> r = new ArrayList<T>(c.size());
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Find row where values for column is maximal in a pandas DataFrame
...ntime, in which case you probably have to go drop many hours worth of work from the database you were outputting results to, bang your head against the wall in IPython trying to manually reproduce the problem, finally figuring out that it's because idxmax can only report the label of the max row, an...
Why is there a difference in checking null against a value in VB.NET and C#?
... Why answer the question by trial and error? Should be possible to do it from the language specifications.
– David Heffernan
Mar 20 '13 at 12:59
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Ignore Typescript Errors “property does not exist on value of type”
... typescript error again you need to write it like that y["x"], not y.x. So from this perspective the other options are better.
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How to search and replace text in a file?
...ctions out of place. I disagree with the other posters suggesting you read from one file and write to another. Instead, I would read the file into memory, fix the data up, and then write it out to the same file in a separate step.
# Read in the file
with open('file.txt', 'r') as file :
filedata =...
PHP session lost after redirect
...written anywhere
Make sure you redirect to the same domain. So redirecting from a www.yourdomain.com to yourdomain.com doesn't carry the session forward.
Make sure your file extension is .php (it happens!)
Now, these are the most common mistakes, but if they didn't do the trick, the problem is mos...
How to convert an integer to a string in any base?
Python allows easy creation of an integer from a string of a given base via
27 Answers
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How to insert a character in a string at a certain position?
...e. I want to display it as a String with a decimal point (.) at 2 digits from the end of int . I wanted to use a float but was suggested to use String for a better display output (instead of 1234.5 will be 1234.50 ). Therefore, I need a function that will take an int as parameter and ret...
D3.js: what is 'g' in .append(“g”) D3.js code?
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I came here from a d3 learning curve as well. As already pointed out this is not specific to d3, it is specific to svg attributes. Here is a really good tutorial explaining the advantages of svg:g (grouping).
It is not that different f...
What's the difference between a catalog and a schema in a relational database?
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From the relational point of view :
The catalog is the place where--among other things--all of the various schemas (external, conceptual, internal) and all of the corresponding mappings (external/conceptual, conceptual/i...