大约有 800 项符合查询结果（耗时：0.0232秒） [XML]
MySQL vs MongoDB 1000 reads
...-------------------------------------------
1000000 872.709µs
SELECT & DISPLAY
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num of rows time taken
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1000000 20.717354746s
UPDAT...
Is MATLAB OOP slow or am I doing something wrong?
...ng each operation 100000 times
style total µsec per call
nop() function: 0.01578 0.16
nop(), 10x loop unroll: 0.01477 0.15
nop(), 100x loop unroll: 0.01518 0.15
nop() subfunction: 0.01559 0.16
@()[] anon...
Sorting arrays in NumPy by column
... per loop
%timeit table[table[:,9].argsort()]
10000 loops, best of 3: 180 µs per loop
import pandas as pd
df = pd.DataFrame(table)
%timeit df.sort_values(9, ascending=True)
1000 loops, best of 3: 400 µs per loop
So, it looks like indexing with argsort is the quickest method so far...
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What are the downsides to using Dependency Injection? [closed]
... answered Mar 9 '10 at 8:34
Håvard SHåvard S
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...
What is the difference between encode/decode?
... encoding. Use u'...'.encode(encoding).
Example:
>>> u'æøå'.encode('utf8')
'\xc3\x83\xc2\xa6\xc3\x83\xc2\xb8\xc3\x83\xc2\xa5'
>>> u'æøå'.encode('latin1')
'\xc3\xa6\xc3\xb8\xc3\xa5'
>>> u'æøå'.encode('ascii')
UnicodeEncodeError: 'ascii' c...
Javascript Shorthand for getElementById
..., in my benchmark it's about three times as slow as a regular function. 0.4µs * 3 = 1.2µs
– Robert
Jun 20 '11 at 15:58
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show 3 more comme...
Extracting extension from filename in Python
Is there a function to extract the extension from a filename?
24 Answers
24
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How can I remove non-ASCII characters but leave periods and spaces using Python?
...ignore all symbols that are not supported. For example, the Swedish letter å is not an ASCII character:
>>>s = u'Good bye in Swedish is Hej d\xe5'
>>>s = s.encode('ascii',errors='ignore')
>>>print s
Good bye in Swedish is Hej d
Edit:
Python3: str ->...
Sum a list of numbers in Python
... sum(i for i in a) is just redundant.
– Jean-François Fabre♦
Apr 18 '18 at 13:37
7
sum(Dec...
When should I create a destructor?
...ed Feb 4 '11 at 13:58
Øyvind BråthenØyvind Bråthen
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