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Read only the first line of a file?
...wline.
The with statement automatically closes the file again when the block ends.
The with statement only works in Python 2.5 and up, and in Python 2.5 you need to use from __future__ import with_statement
In Python 3 you should specify the file encoding for the file you open. Read more...
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How can I center a div within another div? [duplicate]
... be centered within #main_content . However, it is not. Why isn't this working, and how can I fix it?
27 Answers
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Parsing JSON Object in Java [duplicate]
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I'm assuming you want to store the interestKeys in a list.
Using the org.json library:
JSONObject obj = new JSONObject("{interests : [{interestKey:Dogs}, {interestKey:Cats}]}");
List<String> list = new ArrayList<String>();
JSONArray array = obj.getJSON...
Escaping ampersand in URL
...> encodeURIComponent('&')
"%26"
So in your case, the URL would look like:
http://www.mysite.com?candy_name=M%26M
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How can I determine the current line number in JavaScript?
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var thisline = new Error().lineNumber
If that doesn't work in whatever environment you're using, you can try:
var stack = new Error().stack
Then hunt through the stack for the line number.
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PHP json_decode() returns NULL with valid JSON?
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It could be the encoding of the special characters. You could ask json_last_error() to get definite information.
Update: The issue is solved, look at the "Solution" paragraph in the question.
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How to raise a ValueError?
...s the largest index of a specific character in a string, however I would like it to raise a ValueError when the specified character does not occur in a string.
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how to return index of a sorted list? [duplicate]
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You can use the python sorting functions' key parameter to sort the index array instead.
>>> s = [2, 3, 1, 4, 5]
>>> sorted(range(len(s)), key=lambda k: s[k])
[2, 0, 1, 3, 4]
>>>
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Get the client's IP address in socket.io
When using socket.IO in a Node.js server, is there an easy way to get the IP address of an incoming connection? I know you can get it from a standard HTTP connection, but socket.io is a bit of a different beast.
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Difference between Big-O and Little-O Notation
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f ∈ O(g) says, essentially
For at least one choice of a constant k > 0, you can find a constant a such that the inequality 0 <= f(x) <= k g(x) holds for all x > a.
Note that O(g) is the set of all functions for which this condition holds.
f ∈ o(g) says, essentially
Fo...