seek(), then read(), then write() in python

Question

When running the following python code:

>>> f = open(r\"myfile.txt\", \"a+\")        
>>> f.seek(-1,2)                                              


        

Answer 1

Works for me:

$ echo hello > myfile.txt
$ python
Python 2.5.2 (r252:60911, Oct  5 2008, 19:24:49) 
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open('myfile.txt', 'r+')
>>> f.seek(-1, 2)
>>> f.tell()
5L
>>> f.read()
'\n'
>>> f.write('\n')
>>> f.close()

Are you on windows? If so, try 'rb+' instead of 'r+' in the mode.