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Filter dict to contain only certain keys?
...ctionary comprehension.
If you use a version which lacks them (ie Python 2.6 and earlier), make it dict((your_key, old_dict[your_key]) for ...). It's the same, though uglier.
Note that this, unlike jnnnnn's version, has stable performance (depends only on number of your_keys) for old_dicts of any...
TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...序号来拼接数据）。
对于4次挥手，其实你仔细看是2次，因为TCP是全双工的，所以，发送方和接收方都需要Fin和Ack。只不过，有一方是被动的，所以看上去就成了所谓的4次挥手。如果两边同时断连接，那就会就进入到CLOSING...
Elegant Python function to convert CamelCase to snake_case?
...more):
def camel_to_snake(name):
name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
return re.sub('([a-z0-9])([A-Z])', r'\1_\2', name).lower()
print(camel_to_snake('camel2_camel2_case')) # camel2_camel2_case
print(camel_to_snake('getHTTPResponseCode')) # get_http_response_code
print(camel_to_s...
Find and kill a process in one line using bash and regex
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25 Answers
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Minimizing NExpectation for a custom distribution in Mathematica
...ur definition above into simple functions:
pdf[a_, b_, m_, s_, x_] := (1/(2*(a + b)))*a*b*
(E^(a*(m + (a*s^2)/2 - x))*Erfc[(m + a*s^2 - x)/(Sqrt[2]*s)] +
E^(b*(-m + (b*s^2)/2 + x))*Erfc[(-m + b*s^2 + x)/(Sqrt[2]*s)])
pdf2[a_, b_, m_, s_, x_] := pdf[a, b, m, s, Log[x]]/x;
If we plot pdf2 ...
How to initialize a vector in C++ [duplicate]
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When should I use cross apply over inner join?
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Can anyone give me a good example of when CROSS APPLY makes a difference in those cases where...
How do I round a decimal value to 2 decimal places (for output on a page)
... I'm using it to represent dollars and cents, I only want the output to be 2 decimal places.
17 Answers
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How is a CRC32 checksum calculated?
Maybe I'm just not seeing it, but CRC32 seems either needlessly complicated, or insufficiently explained anywhere I could find on the web.
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