Answer to Question #39053 in Python for Sai

Question

I am having two types of files. type1 : 2009.htm, 2010.htm, 2011.htm, 2012.htm
type2: file1.txt, file2.txt, file3.txt, file4.txt

now I have to process the .htm file and write the processed data into the .txt file.
the code for the processing is :
f = open('2009.htm', 'r+')
text = f.read()
pattern = ""
for match in re.findall(pattern, text):
if True:
html = text.replace("", "



")
f1 = open('file1.txt', 'r+')
f1.write(html)
f1.close()

now I have to automate this for all the files using for loops. i have tried one code but in that only the first file is getting copied into all the files.
list1 = ['2009.htm', '2010.htm', '2011.htm', '2012.htm',

'2013.htm']
list2 = ['file1.txt', 'file2.txt', 'file3.txt', 'file4.txt',

'file5.txt']

for x in list1:
for y in list2:
f = open(x, 'r+')
text = f.read()
pattern = ""
for match in re.findall(pattern, text):
if True:
html = text.replace("", "



")
f1 = open(y, 'r+')
f1.write(html)
f1.close()
now what I have do?

Answer 1

We propose the following way:


import re;


list1 = ['D:\2009.htm', 'D:\2010.htm']
list2 = ['D:\file1.txt', 'D:\file2.txt']
for x in zip(list1, list2):
f = open(x[0], 'r+')
text = f.read()
pattern = "aaa"
for match in re.findall(pattern, text):
if True:
html = text.replace("aaa", "bbb")
f1 = open(x[1], 'w+')
f1.write(html)
f1.close()
f.close();


Here zip function allows to obtain input file name as x[0] (because list1 is the first argument), and the output file name as x[1] (because list2 is the second argument in zip), see https://docs.python.org/2/library/functions.html#zip for details.