In Python, the following statements do not work:
f = open("ftmp", "rw")
print >> f, "python"
I get the error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IOError: [Errno 9] Bad file descriptor
But with the following code it works:
g = open("ftmp", "r+")
print >> g, "python"
It looks like I need to revise the file modes. What are the deep intricacies of the file opening modes?
Best Answer
Better yet, let the documentation do it for you: http://docs.python.org/library/functions.html#open. Your issue in the question is that there is no "rw" mode... you probably want 'r+' as you wrote (or 'a+' if the file does not yet exist).