and this line: data_points.append(int(line))
this would turn the string back to an integer, am i right?
Yes.
and on this one: data_points = [ int(line) for line in data_file ]
this did not use any read(), is this already equal to readline()? so this would already store all the data in the txt file to data_points[], am i right?
Yes. A handy feature of Python is that a file object is iterable - you can use a for loop or list comprehension to iterate over the lines of the file without an explicit readline(). So this:
data_points = [ int(line) for line in data_file ]
is roughly equivalent to this (without the list comprehension):
data_points = []
for line in data_file:
data_points.append(int(line))or this (with explicit readline()):
data_points = []
while True:
line = data_file.readline()
if not line:
break
data_points.append(int(line))only the list comprehension is much more concise and, when you get used to it, much clearer.
thank you guys! ei, you two are not competing, are you? anyway, hope its a friendly one. for the benifit of all those newbie like me, hehehe.
Definitely friendly.
Kent
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