Somthing to need...: 1월 2014

2014. 1. 17.

USBs which are bought at lady's market in HongKong

I bought 30 usb at lady's market in HongKong. I thought I was very lucky because they were very chip prices.

But many USBs do not work. Even though copying speed of worked USBs are very slow and one doesn't have no memory chip. (below picture)

2014. 1. 13.

Fish street in Hong kong(홍콩물고기 거리)

홍콩 물고기 거리는 물고기, 파충류 애완견, 애완묘를 팔고 있는데 규모가 매우커서, 청계천 물고기거리/충무로 애완동물거리 보다 훨씬 커보였다.

충격적인 봉지판매 금붕어 : 38홍콩달러(대충 5300원)

좀더 큰 물고기도 봉지에(60hkd :8400 원)

육지거북

---

수초도 봉지에... 우린 택배 올때 ^^

거북이는 1200hkd=168000원

햄스터

aqua street of hong kong

fishes are in the plastic bag for sale.

2014. 1. 10.

Compare running time of String concat methods in python ( only time)

I just describe about concat methods at previous post. Some guy asked me 'just method ?' and I answered 'I will test'.

Only run twice about tree methods. This test show only running time. It does not consider memory usages. Next time I will consider both of them (time and memory).

If you have any advice. comment please.
Thanks.

==Test result. ==

2014-01-10 10:39:56,700 INFO -------------------------------------
2014-01-10 10:39:56,700 DEBUG START(Normal string Plus)
2014-01-10 10:40:06,388 DEBUG END: running time==>9

2014-01-10 10:40:06,390 DEBUG START(StreamWriter)
2014-01-10 10:42:15,395 DEBUG END: running time==>129

2014-01-10 10:42:15,395 DEBUG START(List and Join)
2014-01-10 10:42:27,121 DEBUG END: running time==>11

2014-01-10 10:42:56,802 INFO -------------------------------------
2014-01-10 10:42:56,802 DEBUG START(Normal string Plus)
2014-01-10 10:43:06,098 DEBUG END: running time==>9

2014-01-10 10:43:06,098 DEBUG START(StreamWriter)
2014-01-10 10:45:22,296 DEBUG END: running time==>136

2014-01-10 10:45:22,296 DEBUG START(List and Join)
2014-01-10 10:45:33,914 DEBUG END: running time==>11

== TEST Code ==

import datetime
import time
import sys
import logging
import codecs
import cStringIO, codecs

class StringOperation:

#using +
def run_concat_test_01(self):

for idx in range(1,1000):
src = "{}".format(idx)
for subidx in range(1,10000):
src = src + "AAAAA"
src = src + "BBBBB"
src = src + "BBBBB"
src = src + "CCCCC"
src = src + "한글 " # non romantic

res = src # coppy other

#using writer
def run_concat_test_02(self):

for idx in range(1,1000):
source = cStringIO.StringIO()
wrapper = codecs.getwriter("utf8")(source)
wrapper.writelines("{}".format(idx))

for subidx in range(1,10000):
wrapper.writelines("AAAAA")
wrapper.writelines("BBBBB")
wrapper.writelines("BBBBB")
wrapper.writelines("CCCCC")
wrapper.writelines(u"한글") #non romantic

res = wrapper.getvalue() #copy res

source.close()

# using list + join
def run_concat_test_03(self):

for idx in range(1,1000):
source = []
source.append("{}".format(idx))

for subidx in range(1,10000):
source.append("AAAAA")
source.append("BBBBB")
source.append("BBBBB")
source.append("CCCCC")
source.append(u"한글") #non romantic

res = "".join(source)

def run_test(self, title, func_idx):
funcs={
"plus": self.run_concat_test_01,
"writer": self.run_concat_test_02,
"list":self.run_concat_test_03}

st_time = datetime.datetime.now()
logging.debug("START({})".format(title))

funcs[func_idx]()

ed_time = datetime.datetime.now()
diff_time = ed_time - st_time
logging.debug("END: running time : {} seconds\r\n".format(diff_time.seconds))

today = datetime.date.today()
fname = "{0}{1}{2}-String_operation.log".format(today.year,today.month,today.day)
logging.basicConfig(filename=fname,level=logging.DEBUG, format='%(asctime)s %(levelname)s %(message)s')
logging.info("-------------------------------------")

oTester = StringOperation()

print "Plus Method"
oTester.run_test("Normal string Plus","plus")

print "Writer Method"
oTester.run_test("StreamWriter", "writer")

print "List Method"

oTester.run_test("List and Join","list")

== Running Environment==
windows 7 64bit
memory : 8G
pythone 2.7.3 (32bit) # I used 32bit for compatibility

2014. 1. 8.

Python String concat and Charset

I found first method to use for string-concat. but It makes errors for non-romantic characters. So, I use second method by using join.

1) using StringIO

# coding:utf-8
from cStringIO import StringIO
txt = StringIO()

txt.write("AAAAA")
txt.write("BBBBB")
txt.write("?????") # non romantic characters will occur Error~

other_function( txt.getvalue())

txt.close()

2) using join and list

# coding:utf-8
txt = []

txt.append("AAAAA")
txt.append("BBBBB")
txt.append("??????") # non romantic characters will not occur Error.

other_function( "".join(txt))

3) using Stream ## update ( thank you~, Justin )

source = cStringIO.StringIO()
wrapper = codecs.getwriter("utf8")(source)
wrapper.writelines(unicode("AAAA "))
wrapper.writelines(unicode("non romantic => 비 로만틱"))

other_funcion( source.getvalue().decode("utf-8") )

soruce.close()