大约有 3,517 项符合查询结果（耗时：0.0126秒） [XML]
What is the difference between re.search and re.match?
...enerate_word():
word = [random.choice(string.ascii_lowercase) for _ in range(LENGTH)]
word = ''.join(word)
return word
wordlist = [generate_word() for _ in range(LIST_SIZE)]
start = time.time()
[re.search('python', word) for word in wordlist]
print('search:', time.time() - start)
star...
Best way to randomize an array with .NET
...s a recursive algorithm:
To shuffle an array of size n (indices in the range [0..n-1]):
if n = 0
do nothing
if n > 0
(recursive step) shuffle the first n-1 elements of the array
choose a random index, x, in the range [0..n-1]
swap the element at index n-1 with...
What is the most efficient way to loop through dataframes with pandas? [duplicate]
...hich one of the three is the least time consuming.
t = pd.DataFrame({'a': range(0, 10000), 'b': range(10000, 20000)})
B = []
C = []
A = time.time()
for i,r in t.iterrows():
C.append((r['a'], r['b']))
B.append(time.time()-A)
C = []
A = time.time()
for ir in t.itertuples():
C.append((ir[1], ...
Cannot ping AWS EC2 instance
... me.
But the following rule will work:
Type: All ICMP
Protocol: TCP
Port range: 0 - 65535
Source: Anywhere - 0.0.0.0/0
After doing this you will be able to ping other instances. You should see something like:
PING 10.0.0.15 (10.0.0.15): 56 data bytes
64 bytes from 10.0.0.14: icmp_seq=1 ttl=64 t...
Finding all possible permutations of a given string in python
... # everything to the right of step has not been swapped yet
for i in range(step, len(string)):
# copy the string (store as array)
string_copy = [character for character in string]
# swap the current index with the step
string_copy[step], string_copy[i] = strin...
How to use glOrtho() in OpenGL?
...ue for your vertex's position, it will be clipped if it falls outside that range. Otherwise if it's inside that range, it will appear to have no effect on the position except for Z tests.
share
|
im...
How to find list intersection?
...ps)
r.sort()
print(heading, r)
return r[0]
m = 10
nums = list(range(6 * m))
for n in range(1, m + 1):
a = nums[:6*n:2]
b = nums[:6*n:3]
print('\nn =', n, len(a), len(b))
#print('\nn = %d\n%s %d\n%s %d' % (n, a, len(a), b, len(b)))
la = do_timing('lista', cmd_lista, ...
What is the difference between char, nchar, varchar, and nvarchar in SQL Server?
... are exceptions, see below). By using two bytes per character, a very wide range of characters can be stored, so the basic thing to remember here is that nchar and nvarchar tend to be a much better choice when you want internationalization support, which you probably do.
Now for some some finer poi...
How to write a switch statement in Ruby
...ot x === 1..5.
This allows for sophisticated when clauses as seen above. Ranges, classes and all sorts of things can be tested for rather than just equality.
Unlike switch statements in many other languages, Ruby’s case does not have fall-through, so there is no need to end each when with a bre...
What does the constant 0.0039215689 represent?
...ication by 0.0039215689f converts an integer valued color intensity in the range 0 to 255 to a real valued color intensity in the range 0 to 1.
As Ilmari Karonen points out, even if this is an optimisation it's a rather badly expressed one. It would be so much clearer to multiply by (1.0f/255).
...