blank lines representation in python

[micklee74]

hi
what is the correct way to represent blank lines in python (while
iterating a file) without regexp? I know one way is to use
re.search((line,r'^$') to grab a blank line, but i wanna try not to use
regexp...
is it
1) if line == ''": dosomething() (this also means EOF right? )
2) if line is None: dosomething()
3) if not line: dosomething()
thanks

[Fredrik Lundh]

mi*******@hotmail.com wrote:

what is the correct way to represent blank lines in python (while
iterating a file) without regexp? I know one way is to use
re.search((line,r'^$') to grab a blank line, but i wanna try not to use
regexp...
is it
1) if line == ''": dosomething() (this also means EOF right? )
2) if line is None: dosomething()
3) if not line: dosomething()
thanks

if line == "\n": # look for a single newline
dosomething()

or

if not line:
... end of file ...
elif not line.strip(): # look for lines with nothing but whitespace
dosomething()

</F>