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How do I check if a string is a number (float)?
... clause cannot raise a ValueError: granted, this does not require too much time or brain power, but why use any when none is needed?
– Eric O Lebigot
Jul 5 '13 at 8:21
...
Replace multiple characters in a C# string
...rticle I found when searching "c# regex performance replace" it's about 13 times slower.
– too
Apr 28 '15 at 9:37
...
Is there a Python caching library?
...ctools library.
It's a Last Recently Used cache, so there is no expiration time for the items in it, but as a fast hack it's very useful.
from functools import lru_cache
@lru_cache(maxsize=256)
def f(x):
return x*x
for x in range(20):
print f(x)
for x in range(20):
print f(x)
...
How can I filter a date of a DateTimeField in Django?
I am trying to filter a DateTimeField comparing with a date. I mean:
14 Answers
14
...
Windows下 C++网络延时检测 - C/C++ - 清泛网 - 专注C/C++及内核技术
...nclude <windows.h>
#include <conio.h>
#include <winnt.h>
#define PING_TIMES 2 //ping 4 次
typedef struct _IPINFO
{
unsigned char Ttl; // Time To Live
unsigned char Tos; // Type Of Service
unsigned char IPFlags; // IP flags
unsigned char OptSize; // Size of options data
...
Split by comma and strip whitespace in Python
...ethods in a loop revealed:
[word.strip() for word in string.split(',')]
$ time ./list_comprehension.py
real 0m22.876s
map(lambda s: s.strip(), string.split(','))
$ time ./map_with_lambda.py
real 0m25.736s
map(str.strip, string.split(','))
$ time ./map_with_str.strip.py
real 0m19.428s
...
Remove all the elements that occur in one list from another
...
I just want to add that I timed this vs. the accepted answer and it was more performant by a factor of about 3: timeit.timeit('a = [1,2,3,4]; b = [1,3]; c = [i for i in a if a not in b]', number=100000) -> 0.12061533199999985 timeit.timeit('a = {1,...
Python loop counter in a for loop [duplicate]
...
I'll sometimes do this:
def draw_menu(options, selected_index):
for i in range(len(options)):
if i == selected_index:
print " [*] %s" % options[i]
else:
print " [ ] %s" % options[i]
Thoug...
In Python, what is the difference between “.append()” and “+= []”?
...pyright", "credits" or "license" for more information.
>>> import timeit
>>> timeit.Timer('s.append("something")', 's = []').timeit()
0.20177424499999999
>>> timeit.Timer('s += ["something"]', 's = []').timeit()
0.41192320500000079
Python 2.5.1 (r251:54863, Apr 18 2007, 0...
pandas: How do I split text in a column into multiple rows?
...oned "a large csv file", let me suggest to try in a shell Dan's solution:
time python -c "import pandas as pd;
df = pd.DataFrame(['a b c']*100000, columns=['col']);
print df['col'].apply(lambda x : pd.Series(x.split(' '))).head()"
... compared to this alternative:
time python -c "import pandas a...