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Why do you need to invoke an anonymous function on the same line?
...sures and saw this everywhere, but there is no clear explanation how it works - everytime I was just told to use it...:
19 ...
What is the difference between LL and LR parsing?
...string, whereas LR parsers begin at the target string and try to arrive back at the start symbol.
An LL parse is a left-to-right, leftmost derivation. That is, we consider the input symbols from the left to the right and attempt to construct a leftmost derivation. This is done by beginning at the...
Paste multiple columns together
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Brian DiggsBrian Diggs
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Removing a list of characters in string
...>> re.sub(rx, '', subj)
'ABC'
(re.escape ensures that characters like ^ or ] won't break the regular expression).
C. Use the mapping variant of translate:
>>> chars_to_remove = [u'δ', u'Γ', u'ж']
>>> subj = u'AжBδCΓ'
>>> dd = {ord(c):None for c in chars_to_...
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
...a query optimizer would have to catch the fact that your GROUP BY is not taking advantage of any group members, just their keys. DISTINCT makes this explicit, so you can get away with a slightly dumber optimizer.
When in doubt, test!
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Should I use s and s inside my s?
...he nav element communicates that we're dealing with a major navigation block
The list communicates that the links inside this navigation block form a list of items
At http://w3c.github.io/html/sections.html#the-nav-element you can see that a nav element could also contain prose.
So yes, having a...
RESTful URL design for search
I'm looking for a reasonable way to represent searches as a RESTful URLs.
12 Answers
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Redis: Show database size/size for keys
My redis instance seems to being growing very large and I'd like to find out which of the multiple databases I have in there consumes how much memory. Redis' INFO command just shows me the total size and the number of keys per database which doesn't give me much insight... So any tools/ideas that ...
Sending a notification from a service in Android
I have a service running, and would like to send a notification. Too bad, the notification object requires a Context , like an Activity , and not a Service .
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Linux command to list all available commands and aliases
... could run.
compgen -b will list all the built-ins you could run.
compgen -k will list all the keywords you could run.
compgen -A function will list all the functions you could run.
compgen -A function -abck will list all the above in one go.
Check the man page for other completions you can genera...