大约有 3,516 项符合查询结果（耗时：0.0117秒） [XML]
List of Big-O for PHP functions
...res a linear poll.
Obvious Big-O:
array_fill O(n)
array_fill_keys O(n)
range O(n)
array_splice O(offset + length)
array_slice O(offset + length) or O(n) if length = NULL
array_keys O(n)
array_values O(n)
array_reverse O(n)
array_pad O(pad_size)
array_flip O(n)
array_sum O(n)
array_produ...
How do I put a variable inside a string?
...file2.pdf' etc. This is how it worked:
['file' + str(i) + '.pdf' for i in range(1,4)]
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Numpy array dimensions
...ow 1 and column 0, 0-based index)
shape
describes how many data (or the range) along each available axis.
In [5]: a.shape
Out[5]: (2, 2) # both the first and second axis have 2 (columns/rows/pages/blocks/...) data
shar...
How to convert hex to rgb using Java?
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A hex color code is #RRGGBB
RR, GG, BB are hex values ranging from 0-255
Let's call RR XY where X and Y are hex character 0-9A-F, A=10, F=15
The decimal value is X*16+Y
If RR = B7, the decimal for B is 11, so value is 11*16 + 7 = 183
public int[] getRGB(String rgb){
int[...
How to map with index in Ruby?
...o you can call map, select, reject etc. on it just like on an array, hash, range etc.
– sepp2k
Jan 15 '11 at 1:45
9
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What is the source code of the “this” module doing?
...
This is called rot13 encoding:
d = {}
for c in (65, 97):
for i in range(26):
d[chr(i+c)] = chr((i+13) % 26 + c)
Builds the translation table, for both uppercase (this is what 65 is for) and lowercase (this is what 97 is for) chars.
print "".join([d.get(c, c) for c in s])
Prints...
Multiplication on command line terminal
...other higher-order function
pythonp "n=10;functools.reduce(lambda x,y:x*y, range(1,n+1))"
3628800
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How to print a groupby object
... = pd.DataFrame({'A': ['one', 'one', 'two', 'three', 'three', 'one'], 'B': range(6)})
Then simple 1 line code
df.groupby('A').apply(print)
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Add SUM of values of two LISTS into new LIST
...eed zip, numpy or anything else.
Python 2.x and 3.x:
[a[i]+b[i] for i in range(len(a))]
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Strip all non-numeric characters from string in JavaScript
...ters from a string using JavaScript/ECMAScript. Any characters that are in range 0 - 9 should be kept.
10 Answers
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