用PYTHON批量將PDF保存為圖片

__author__ = 'kong'
#!/usr/bin/env python

import PythonMagick
from PyPDF2 import PdfFileReader

for j in range(0,23):
print(j)
if j<10:
oclock="0"+str(j)
else:
oclock=str(j)
pdffile = "C:\Users\kong\Desktop\950hPa\\2006to2011,05,"+oclock+"UTC950.pdf"
reader = PdfFileReader(file(pdffile, "rb"))
npage = reader.getNumPages()
for i in range(0, npage):
im = PythonMagick.Image(pdffile + '['+ str(i) +']')
im.write(pdffile[0:-4] + '_' + str(i)+ '.png')