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Evaluating a mathematical expression in a string
...>>> eval_expr('2^6')
4
>>> eval_expr('2**6')
64
>>> eval_expr('1 + 2*3**(4^5) / (6 + -7)')
-5.0
"""
return eval_(ast.parse(expr, mode='eval').body)
def eval_(node):
if isinstance(node, ast.Num): # <number>
return node.n
el...
Is it safe to parse a /proc/ file?
...l-space buffer during a single read.
I tested that with a program using a 64K read buffer but it results in a kernel space buffer of 3072 bytes in my system for proc_read to return data. Multiple calls with advancing pointers are needed to get more than that much text returned. I don't know what ...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
...dist( X, Y, **kwargs )
d = np.empty( (X.shape[0], Y.shape[0]), np.float64 )
if sxy == 2:
for j, x in enumerate(X):
d[j] = cdist( x.todense(), Y, **kwargs ) [0]
elif sxy == 1:
for k, y in enumerate(Y):
d[:,k] = cdist( X, y.todense(), **kwargs ) [0]
...
What's the difference between including files with JSP include directive, JSP include action and usi
...od of the generated servlet, the method can grow very large. If it exceeds 64 KB, your JSP compilation will likely fail.
<jsp:include> - The JSP Action tag on the other hand instructs the container to pause the execution of this page, go run the included page, and merge the output from that ...
What does “use strict” do in JavaScript, and what is the reasoning behind it?
...scal MARTIN
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How do malloc() and free() work?
...
64
Soooo many people don't realise that free() may not return memory to the OS, it's infuriating. Thanks for helping enlighten them.
...
What does O(log n) mean exactly?
...
648
O(log N) basically means time goes up linearly while the n goes up exponentially. So if it tak...
multiprocessing.Pool: When to use apply, apply_async or map?
..._callback()
may yield a result such as
[1, 0, 4, 9, 25, 16, 49, 36, 81, 64]
Notice, unlike pool.map, the order of the results may not correspond to the order in which the pool.apply_async calls were made.
So, if you need to run a function in a separate process, but want the current process t...
Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
...eep around the current cursor location: http://jsfiddle.net/benmosher/0x4mc64v/4/
(The normal array is the result of calling rnorm(100) in my R console. Simplest way I could think of in JS to sample a normally-distributed random integer.)
...
What is the best way to solve an Objective-C namespace collision?
...g the modern or legacy runtimes, are you fat or single architecture, 32 or 64 bit, what OS releases are you targeting, are you dynamically linking, statically linking, or do you have a choice, and is it potentially okay to do something that might require maintenance for new software updates.
If you...