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What is the difference between NaN and None?
...dcsv() and then assigning the values to a dictionary. The columns contain strings of numbers and letters. Occasionally there are cases where a cell is empty. In my opinion, the value read to that dictionary entry should be None but instead nan is assigned. Surely None is more descriptive of a...
Case insensitive XPath contains() possible?
...over all textnodes of my DOM and check if the nodeValue contains a certain string.
6 Answers
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Unpack a list in Python?
...
function_that_needs_strings(*my_list) # works!
You can read all about it here.
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Is there a cross-domain iframe height auto-resizer that works?
...e is belongs to the top page domain, which you call this page with a query string that saves size value to a cookie, outer page checks this query with some interval. But it is not a good solution so you should follow this one:
In Top page :
window.addEventListener("message", (m)=>{iframeResizin...
Python's “in” set operator
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This is not a very good test since string constants are often interned (try a = 'a'; b = 'a'; a is b). I tried it with a = (1, 2, 3); b = (1, 2, 3); a == b; hash(a) == hash(b); a is b; a in set([b]) instead.
– Philipp
Jan...
When do you use Git rebase instead of Git merge?
... (one will have branches, the other won't).
Merge will generally create an extra commit (e.g. node in the tree).
Merge and rebase will handle conflicts differently. Rebase will present conflicts one commit at a time where merge will present them all at once.
So the short answer is to pick rebase ...
HashMap get/put complexity
... assume the following three cases:
HashMap<Integer, V>
HashMap<String, V>
HashMap<List<E>, V>
Do they have the same complexity? Well, the amortised complexity of the 1st one is, as expected, O(1). But, for the rest, we also need to compute hashCode() of the lookup elemen...
How to pass an ArrayList to a varargs method parameter?
...y for no reason.)
Here's a complete example:
public static void method(String... strs) {
for (String s : strs)
System.out.println(s);
}
...
List<String> strs = new ArrayList<String>();
strs.add("hello");
strs.add("wordld");
method(strs.toArray(new String...
Store images in a MongoDB database
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You can try this one:
String newFileName = "my-image";
File imageFile = new File("/users/victor/images/image.png");
GridFS gfsPhoto = new GridFS(db, "photo");
GridFSInputFile gfsFile = gfsPhoto.createFile(imageFile);
gfsFile.setFilename(newFileNam...
if, elif, else statement issues in Bash
...s a fixed version:
#!/bin/bash
if [ "$seconds" -eq 0 ]; then
timezone_string="Z"
elif [ "$seconds" -gt 0 ]; then
timezone_string=$(printf "%02d:%02d" $((seconds/3600)) $(((seconds / 60) % 60)))
else
echo "Unknown parameter"
fi
...