Asrarahmed Kadri wrote:
> Here is the complete code:
> fd is the file handle.
>
> import sys
>
> def check_dup(fd1):
> print fd1
> fd1.seek(0,0)
> done = 0
> list1 = []
> while not done:
> x = fd1.readline()
> if x == "":
> done = 1
> else:
> list1.append(x)
> return list1
>
>
> fname = raw_input("Enter the file name to write data to:\t")
>
> fd = open(fname,'a+')
> print fd
> done = 0
>
> while not done:
> str = raw_input("Enter login name:\t to quit type 'q'")
>
> if str == 'q':
> done = 1
> else:
> flag = check_dup(fd)
> print flag
> if str in flag:
> print "Login already exists.!!"
> else:
> fd.seek(0,2)
> fd.write(str + '\n')
I don't know why this isn't working, but I do know a better way to write
it that will work. Keep the list of login names in a list in memory
until you have all the names, then write them to a file. Your program
will look something like this:
ask the file name
open the file for reading and read all the names into a list
close the file
while not done:
ask the user for a name
if the name is not in the list:
add the name to the list
open the file for writing
write the list to the file
close the file
Kent
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
