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Fast way of counting non-zero bits in positive integer
...You can generate it at runtime:
counts = bytes(bin(x).count("1") for x in range(256)) # py2: use bytearray
Or just define it literally:
counts = (b'\x00\x01\x01\x02\x01\x02\x02\x03\x01\x02\x02\x03\x02\x03\x03\x04'
b'\x01\x02\x02\x03\x02\x03\x03\x04\x02\x03\x03\x04\x03\x04\x04\x05'
...
How to perform element-wise multiplication of two lists?
...ment in a loop. The short hand for doing that is
ab = [a[i]*b[i] for i in range(len(a))]
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Best way to create a simple python web service [closed]
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Raw CGI is kind of a pain, Django is kind of heavyweight. There are a number of simpler, lighter frameworks about, e.g. CherryPy. It's worth looking around a bit.
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Get: TypeError: 'dict_values' object does not support indexing when using python 3.2.3 [duplicate]
...) in a call to list like so:
v = list(d.values())
{names[i]:v[i] for i in range(len(names))}
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How to remove the left part of a string?
...requires section headers to be present
path = config.get(section, 'path', raw=1) # case-insensitive, no interpolation
Other options
str.split()
re.match()
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How to know/change current directory in Python shell?
...tever, you need to double up backslashes if you use them in a regular (non-raw) Python string. Python also lets you use forward slashes instead. Thus, either os.chdir('C:/Users/Ajeya/Documents'), or os.chdir('C:\\Users\\Ajeya\\Documents'), or os.chdir(r'C:\Users\Ajeya\Documents').
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How to have jQuery restrict file types on upload?
... name="file" onchange="checkFileSize(this, @Model.MaxSize.ToString(),@Html.Raw(Json.Encode(Model.FileExtensionsList)))" />
Javascript:
//function for check attachment size and extention match
function checkFileSize(element, maxSize, extentionsArray) {
var val = $(element).val(); //get fil...
How to do URL decoding in Java?
...g (such as UTF-8 or ASCII) is what determines the mapping of characters to raw bytes. For a good intro to character encodings, see this article.
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Validate that a string is a positive integer
...If you want it to be a normalized decimal integer string over a reasonable range of values, you can do this:
function isNormalInteger(str) {
var n = Math.floor(Number(str));
return n !== Infinity && String(n) === str && n >= 0;
}
or if you want to allow whitespace and l...
Running a Python script from PHP
...d display the output
passthru() - Execute an external program and display raw output
Source: http://php.net/manual/en/function.exec.php
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