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')
>
Thank you. I can't get this to fail, so I wonder whether it has to do
with permissions? What OS are you running on?
Also note when you open a file for output (append or write) it is
inadvisable to change the file position or to read it ( as you are doing).
As Kent points out there are better ways to do what you are doing. My
(minimalist?) version is:
fname = raw_input("Enter the file name to write data to:\t")
fd = open(fname,'a+')
names = set()
while 1:
name = raw_input("Enter login name:\t to quit type 'q'")
if name == 'q': break
if name in names: print "Login already exists.!!"
names.add(name)
fname.write('\n'.join(names))
--
Bob Gailer
510-978-4454
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