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How can I time a code segment for testing performance with Pythons timeit?
...e and after the block you want to time.
import time
t0 = time.time()
code_block
t1 = time.time()
total = t1-t0
This method is not as exact as timeit (it does not average several runs) but it is straightforward.
time.time() (in Windows and Linux) and time.clock() (in Linux) are not precise eno...
What is the best way to compute trending topics or tags?
...wing code demonstrates this.
from math import sqrt
class zscore:
def __init__(self, pop = []):
self.number = float(len(pop))
self.total = sum(pop)
self.sqrTotal = sum(x ** 2 for x in pop)
def update(self, value):
self.number += 1.0
self.total += valu...
Python string.join(list) on object array rather than string array
...
The built-in string constructor will automatically call obj.__str__:
''.join(map(str,list))
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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...安装程序包
wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.8.tgz
注意linux生产环境不能安装32位的mongodb，因为32位受限于操作系统最大2G的文件限制。
#解压下载的压缩包
tar xvzf mongodb-linux-x86_64-2.4.8.tgz
4、分别在...
How to convert a scala.List to a java.util.List?
...1,2,3))
From Scala 2.8 onwards:
import scala.collection.JavaConversions._
import scala.collection.mutable.ListBuffer
asList(ListBuffer(List(1,2,3): _*))
val x: java.util.List[Int] = ListBuffer(List(1,2,3): _*)
However, asList in that example is not necessary if the type expected is a Java List,...
PHP Pass variable to next page
...n cookies. More secure, but not completely secure.
Session:
//On page 1
$_SESSION['varname'] = $var_value;
//On page 2
$var_value = $_SESSION['varname'];
Remember to run the session_start(); statement on both these pages before you try to access the $_SESSION array, and also before any output i...
Pickle or json?
...ccf1b3fa91f4399902bb534/raw/03e8dbab11b5605bc572bc117c8ac34cfa959a70/pickle_vs_json.py
python pickle_vs_json.py
Results with python 2.7 on a decent 2015 Xeon processor:
Dir Entries Method Time Length
dump 10 JSON 0.017 1484510
load 10 JSON 0.375 -
dump 10 Pickle 0.011 ...
Catch an exception thrown by an async void method
...er
When the async result has arrived it is traced.
static TypeHashes _type = new TypeHashes(typeof(Program));
private void Run()
{
TracerConfig.Reset("debugoutput");
using (Tracer t = new Tracer(_type, "Run"))
{
for (int i = 0; i < 4; i++)
{
...
Hash Map in Python
...anged easily.
Rehashing is out of scope of this code.
class Node:
def __init__(self, key, value):
self.key = key
self.value = value
self.next = None
class HashMap:
def __init__(self):
self.store = [None for _ in range(16)]
def get(self, key):
ind...
Is there a performance difference between a for loop and a for-each loop?
...g4j.Marker, org.apache.logging.log4j.Marker...);
Code:
0: iconst_0
1: istore_2
2: aload_1
3: arraylength
4: istore_3
5: iload_2
6: iload_3
7: if_icmpge 29
10: aload_1
11: iload_2
12: aaload
13: astore 4
...