大约有 800 项符合查询结果（耗时：0.0287秒） [XML]
UnicodeDecodeError when redirecting to file
...n when redirected to a file.
#coding: utf8
import sys
uni = u'αßΓπΣσµτΦΘΩδ∞φ'
print >>sys.stderr,sys.stdout.encoding
print uni
Output (run directly from terminal)
cp437
αßΓπΣσµτΦΘΩδ∞φ
Python correctly determined the encoding of the terminal.
Output (redirec...
Deleting lines from one file which are in another file
...
This has O(n²) complexity and will start to take hours to complete once the files contain more than a few K lines.
– Arnaud Le Blanc
Jan 24 '11 at 10:59
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How to manually expand a special variable (ex: ~ tilde) in bash
... Preferably, I'd go with either of these two:
Charle's Duffy's solution
Håkon Hægland's solution
Original answer for historic purposes (but please don't use this)
If I'm not mistaken, "~" will not be expanded by a bash script in that manner because it is treated as a literal string "~". You...
Pandas - Get first row value of a given column
...ter than using .iloc:
In [1]: %timeit -n 1000 df['Btime'].values[20]
5.82 µs ± 142 ns per loop (mean ± std. dev. of 7 runs, 1000 loops each)
In [2]: %timeit -n 1000 df['Btime'].iloc[20]
29.2 µs ± 1.28 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
...
How to deal with floating point number precision in JavaScript?
...
@mlathe: Doh.. ;P... Between 2⁵²=4,503,599,627,370,496 and 2⁵³=9,007,199,254,740,992 the representable numbers are exactly the integers. For the next range, from 2⁵³ to 2⁵⁴, everything is multiplied by 2, so the representable numbers are the eve...
Pandas conditional creation of a series/dataframe column
...map( lambda x: 'red' if x == 'Z' else 'green')
1000 loops, best of 3: 239 µs per loop
1000 loops, best of 3: 523 µs per loop
1000 loops, best of 3: 263 µs per loop
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Getting a map() to return a list in Python 3.x
...imeit -r5 ordinals = list(range(45))
... list(map(chr, ordinals))
...
3.91 µs ± 60.2 ns per loop (mean ± std. dev. of 5 runs, 100000 loops each)
>>> %%timeit -r5 ordinals = list(range(45))
... [*map(chr, ordinals)]
...
3.84 µs ± 219 ns per loop (mean ± std. dev. of 5 runs, 100000 loo...
Big O, how do you calculate/approximate it?
... ^ 2 / 4 ) + C * N
f(N) = C * 1/4 * N ^ 2 + C * N
And the BigOh is:
O(N²)
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LaTeX source code listing like in professional books
...r 12 '09 at 17:13
Tormod FjeldskårTormod Fjeldskår
5,75611 gold badge2525 silver badges4747 bronze badges
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How to implement the Android ActionBar back button?
... answered Apr 17 '15 at 7:30
Sågär ŚåxëńáSågär Śåxëńá
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