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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...
String formatting: % vs. .format vs. string literal
...
To answer your second question, string formatting happens at the same time as any other operation - when the string formatting expression is evaluated. And Python, not being a lazy language, evaluates expressions before calling functions, so in your log.debug example, the expression "some debug...
How do you run your own code alongside Tkinter's event loop?
...f after(self, ms, func=None, *args):
"""Call function once after given time.
MS specifies the time in milliseconds. FUNC gives the
function which shall be called. Additional parameters
are given as parameters to the function call. Return
identifier to cancel scheduling with aft...
How to get the system uptime in Windows? [closed]
I am using windows 7 and xp. I want to know the uptime of the system.
3 Answers
3
...
How to use 'find' to search for files created on a specific date? [closed]
...tems (FreeBSD, OS/X...) -newerBt will match on the file's birth (creation) time.
– Stephane Chazelas
Jul 21 '14 at 13:20
...