[Tutor] How to write strings with new line character in a file OOPS CORRECTION

[Bob Gailer]

Bob Gailer wrote:
> 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)) <<<< OOPS
>   
Should be fd.write('\n'.join(names))
>
>   


-- 
Bob Gailer
510-978-4454