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python design patterns [closed]
... The third link is dead. Tried to find mirror but couldn't, If anybody has the correct link please add
– formatkaka
Oct 27 '16 at 12:40
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What's the best way to send a signal to all members of a process group?
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You don't say if the tree you want to kill is a single process group. (This is often the case if the tree is the result of forking from a server start or a shell command line.) You can discover process groups using GNU ps as follows:
p...
Should a return statement be inside or outside a lock?
...ideal, but I wouldn't bend the code out of shape just to achieve it... And if the alternative is declaring a local variable (outside the lock), initializing it (inside the lock) and then returning it (outside the lock), then I'd say that a simple "return foo" inside the lock is a lot simpler.
To sh...
Why return NotImplemented instead of raising NotImplementedError
...hould ask someone else to satisfy the operation. In the expression a == b, if a.__eq__(b) returns NotImplemented, then Python tries b.__eq__(a). If b knows enough to return True or False, then the expression can succeed. If it doesn't, then the runtime will fall back to the built-in behavior (which ...
Numpy: Get random set of rows from 2D array
...mask = numpy.random.choice([False, True], len(data_arr), p=[0.75, 0.25])
Now you can call data_arr[mask] and return ~25% of the rows, randomly sampled.
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Angular JS break ForEach
...y where I stuck...and this helped..thanks a ton...Anyways I would like to know the reason for making forEach loop unbreakable . If any
– Saurabh Tiwari
Oct 4 '15 at 7:10
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Multiple aggregations of the same column using pandas GroupBy.agg()
...put
column names, pandas accepts the special syntax in GroupBy.agg(),
known as “named aggregation”, where
The keywords are the output column names
The values are tuples whose first element is the column to select and the second element is the aggregation to apply to that column.
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Why do x86-64 systems have only a 48 bit virtual address space?
...al answer is that AMD was just being cheap and hoped nobody would care for now, but I don't have references to cite.
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What's the difference between echo, print, and print_r in PHP?
...ess the same; they are both language constructs that display strings. The differences are subtle: print has a return value of 1 so it can be used in expressions whereas echo has a void return type; echo can take multiple parameters, although such usage is rare; echo is slightly faster than print. (P...
How to HTML encode/escape a string? Is there a built-in?
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Now that would be silly. I don't care much if it gets escaped or not. I'm just noting it's not required per the html specs.
– kch
Mar 28 '09 at 15:20
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