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What is the most efficient way of finding all the factors of a number in Python?
...sented by @agf is great, but one can achieve ~50% faster run time for an arbitrary odd number by checking for parity. As the factors of an odd number always are odd themselves, it is not necessary to check these when dealing with odd numbers.
I've just started solving Project Euler puzzles myself. ...
How to find list of possible words from a letter matrix [Boggle Solver]
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My answer works like the others here, but I'll post it because it looks a bit faster than the other Python solutions, from setting up the dictionary faster. (I checked this against John Fouhy's solution.) After setup, the time to solve is down in the noise.
grid = "fxie amlo ewbx astu".split()
nro...
How to convert an integer to a string in any base?
...alphabet). There was no attempt to give a solution which converts to any arbitrary base from 2 to infinity.
So here is a super simple solution:
def numberToBase(n, b):
if n == 0:
return [0]
digits = []
while n:
digits.append(int(n % b))
n //= b
return digits...
What is the proper #include for the function 'sleep()'?
...tandard function.
On UNIX, you shall include <unistd.h>.
On MS-Windows, Sleep is rather from <windows.h>.
In every case, check the documentation.
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Are there disadvantages to using a generic varchar(255) for all text-based fields?
...thus in temp tables or sorted results.
I have helped MySQL users who unknowingly created 1.5GB temp tables frequently and filled up their disk space. They had lots of VARCHAR(255) columns that in practice stored very short strings.
It's best to define the column based on the type of data that you...
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windbg 备忘Windbg：[||system_index ]|process_index:thread_index>system_index：0，本地活动的用户态调试；1，内核转储文件thread_index：kd，内核...Windbg：
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What is the purpose of the EBP frame pointer register?
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@augurar: Fixed. Thanks. I'm a bit of a grammar grump myself :)
– Mike Dunlavey
Feb 14 '14 at 3:06
3
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urllib2.HTTPError: HTTP Error 403: Forbidden
...'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7'
url = "http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers"
headers={'User-Agent':user_agent,}
request=urllib.request.Request(url,None,headers) #The assembled request
response = urllib.request.u...
ERROR 1396 (HY000): Operation CREATE USER failed for 'jack'@'localhost'
...ER failed for ...". I wish I could get mysql/mariadb to elaborate a little bit on that error, like WHY it failed.
– David M. Karr
Mar 15 '17 at 20:08
4
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Is there a code obfuscator for PHP? [closed]
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