DZone Snippets: Jakob's Code Snippets

Batch loop for wave to mp3 (using lame)

jakob () — Mon, 05 May 2008 19:57:11 GMT

It keeps the input files and sorts both mp3 and wave files nicely in two separate directories.



@echo off

if NOT EXIST MP3 md MP3

if NOT EXIST WAV md WAV



for %%f in (*.wav) do (

	cls

	lame -b 96 -V 5 -B 128 -m j --vbr-new -q 5 "%%f" "MP3\%%f.mp3"

	move "%%f" WAV

)

Update DynDNS hostname

jakob () — Mon, 05 May 2008 19:45:30 GMT

See DynDNS Update Specifications .



curl -v -k -u jakobm "https://members.dyndns.org/nic/update?hostname=jakobm.dyndns.org&myip=217.80.116.128&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG"

Filesize with nice units

jakob () — Sun, 27 Apr 2008 11:16:38 GMT

Simple function to format filesizes in bytes to human-readable units.



def prettySize(size):

	suffixes = [("B",2**10), ("K",2**20), ("M",2**30), ("G",2**40), ("T",2**50)]

	for suf, lim in suffixes:

		if size > lim:

			continue

		else:

			return round(size/float(lim/2**10),2).__str__()+suf



print prettySize(213458923)

# Output: 203.57M



print prettySize(1234)

# Output: 1.21K

Calculate Pi

jakob () — Sat, 26 Apr 2008 14:57:34 GMT

This script presents a way to compute Pi using a statistic method.
See http://en.wikipedia.org/wiki/Computing_π for further algorithms.



import random, math



class calcPi:

    def __init__(self):

        self.times = pow(10,6)

        self.i = 0

        self.isnot = 0



    def IsOnCircle(self,x,y):

        if math.sqrt(x**2+y**2) < 1:

            return True

        else:

            return False

    

    def run(self):

        for x in range(self.times):

            x,y = random.random(),random.random()

            if self.IsOnCircle(x,y):

                self.i+=1

            else:

                self.isnot+=1

    

    def getResults(self):

        return (float(self.i), float(self.isnot))



    def getPi(self):

        self.run()

        r = self.getResults()

        return r[0]/(r[0]+r[1])*4



if __name__ == '__main__':

    print calcPi().getPi()

Progress bar

jakob () — Sat, 26 Apr 2008 14:41:49 GMT

This is a simple class to generate char-based progress bars.

Example:
[++++++ ]



class Bar:

	def __init__(self):

		self.len = 80

		self.chars = (' ', '+')

		self.wrap = ('[', ']')

		self.filledc = 0



	def fill(self, i):

		assert not (i > 100) or (i < 0)

		self._setP(i)



	def _setP(self, p):

		self.filledc = int(round(float(self.len*p)/100))



	def show(self):

		out = []

		out.append(self.wrap[0])

		out.append(self.filledc*self.chars[1])

		out.append((self.len-self.filledc)*self.chars[0])

		out.append(self.wrap[1])

		return "".join(out)



b = Bar()

b.len = 20

b.fill(20)

print b.show()