Modifying a date format

[jehoshua]

I have some QIF data in a file, and the 'Date" record needs modifying. The Dates are of the format

D4/7'2004

and they need to be changed to

D04/07/2004

f = open("ANCU.qif","r")
lines = f.readlines()

for line in lines:
    first_char = line[0]

    if(first_char == "D"):
        print("Found a date record")
        print(first_char)
        new_line = line.replace("'","/")
        parts = new_line.split("/",2)
        print(parts)
        new = "/".join(parts)
        print(new)
    else:
        print("Nope")
        print(first_char)

# closing the file
f.close()

is producing ..

Found a date record
D
['D6', '30', '2005\n']
D6/30/2005

Nope
C
Nope
T
Nope
P
Nope
L
Nope
^
Found a date record
D
['D7', '7', '2005\n']
D7/7/2005

Nope
C
Nope
M
Nope
T
Nope
P
Nope
L
Nope
^

so the code is nearly there. The dates are in MM/DD/YYYY format. The rules for the code need to be if the MM or DD is a length of one char, then add the leading zero. Also I assume the \n is a carriage return or line feed to indicate a record separation.

I also need to write a new file with only the date records modified, so that needs to be added in wherever the print statements are, or similar.