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Relative imports in Python 3
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unfortunately, this module needs to be inside the package, and it also
needs to be runnable as a script, sometimes. Any idea how I could
achieve that?
It's quite common to have a layout like this...
main.py
mypackage/
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计算统计特征（正态分布）函数及实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ax_v = -10000000000.0;
double min_v = 10000000000.0;
double v;
for (auto i = b; i != e; ++i) {
if (!filter(*i))
continue;
++count;
v = f(*i);
if (v > max_v)
max_v = v;
if (v < min_v)
min_v = v;
sum_v += v;
sum_2_v += v * v;
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How to pretty-print a numpy.array without scientific notation and with given precision?
I'm curious, whether there is any way to print formatted numpy.arrays , e.g., in a way similar to this:
14 Answers
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C++ mark as deprecated
...in an interface that I want to deprecate with portable C++.
When I Googled for this all I got was a Microsoft specific solution; #pragma deprecated and __declspec(deprecated) .
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How to create a custom string representation for a class object?
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print C
Use __str__ if you mean a readable stringification, use __repr__ for unambiguous representations.
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Is there a Python caching library?
I'm looking for a Python caching library but can't find anything so far. I need a simple dict -like interface where I can set keys and their expiration and get them back cached. Sort of something like:
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How do I achieve the theoretical maximum of 4 FLOPs per cycle?
How can the theoretical peak performance of 4 floating point operations (double precision) per cycle be achieved on a modern x86-64 Intel CPU?
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Dictionary vs Object - which is more efficient and why?
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By default, instances of both old and new-style classes have a dictionary for attribute storage. This wastes space for objects having very few instance variables. The space consumption can become acute when creating large numbers of instances.
The default can be overridden by defining __slots__ in ...
Define a lambda expression that raises an Exception
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There is more than one way to skin a Python:
y = lambda: (_ for _ in ()).throw(Exception('foobar'))
Lambdas accept statements. Since raise ex is a statement, you could write a general purpose raiser:
def raise_(ex):
raise ex
y = lambda: raise_(Exception('foobar'))
But if y...
Evaluating a mathematical expression in a string
...etic expressions. Below, I've rewrapped fourFn into a numeric parser class for easier reuse.
from __future__ import division
from pyparsing import (Literal, CaselessLiteral, Word, Combine, Group, Optional,
ZeroOrMore, Forward, nums, alphas, oneOf)
import math
import operator...