#open() returns a file object, and is most commonly used with two arguments:
#"open(filename, mode)".
f=open('/tmp/workfile', 'w')
print f
# mode can be 'r' when the file will only be read,
# 'w' for only writing (an existing file with the same name will be erased),
# 'a' opens the file for appending; any data written to the file is automatically
# added to the end.
# 'r+' opens the file for both reading and writing.
# The mode argument is optional; 'r' will be assumed if it's omitted.
# On Windows and the Macintosh, 'b' appended to the mode opens the file in binary
# mode
# so there are also modes like 'rb', 'wb', and 'r+b'.
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