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How to use XPath in Python?
...e ( which is included in Python 2.5 ). If you need full spec compliance or raw speed and can cope with the distribution of native code, go with libxml2.
Sample of libxml2 XPath Use
import libxml2
doc = libxml2.parseFile("tst.xml")
ctxt = doc.xpathNewContext()
res = ctxt.xpathEval("//*")
if len(...
How to add texture to fill colors in ggplot2
...s done for the horizontal lines but a new data frame is needed for each redraw where I have subtracted a value (in my example '5') from the value associated with the variable of interest. Effectively lowering the height of the bar. This is clunky to achieve and there may be more streamlined approach...
B-Tree vs Hash Table
...than with a tree algorithm (O(1) instead of log(n)), but you cannot select ranges (everything in between x and y).
Tree algorithms support this in Log(n) whereas hash indexes can result in a full table scan O(n).
Also the constant overhead of hash indexes is usually bigger (which is no factor in the...
Random strings in Python
...= string.ascii_lowercase
return ''.join(random.choice(letters) for i in range(length))
Results:
>>> randomword(10)
'vxnxikmhdc'
>>> randomword(10)
'ytqhdohksy'
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What's the difference between ASCII and Unicode?
...s all world wide alphabets. Hence the size of char in java is 2 bytes. And range is 0 to 65535.
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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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How to dynamically compose an OR query filter in Django?
...
How can you compose raw queries with Django if you want to add optional conditions like above?
– user
Jul 13 '14 at 18:34
...
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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I keep getting “Uncaught SyntaxError: Unexpected token o”
... noticed some garbage in the HTML response.
Long story short check your raw HTML response data and you might turn something up.
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Maximum length of the textual representation of an IPv6 address?
...it address and for storage it would probably be best to standardise on the raw colon separated format, i.e. [0000:0000:0000:0000:0000:ffff:c0a8:64e4] for the address above.
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