Chris McDonough wrote:
> News wrote:
>... Can Python
>> create list dynamically, I want to implement a program which will read
>> data
>> from a file and store each line into a list, is this possible?
>
> L = []
> [L.append(line) for line in (open('filename.txt')]
>
> - C
Woops, crossed wires there:
after:
somefile = open('filename.txt')
You can do:
L = somefile.readlines()
or
L = [line for line in somefile]
or
L = []
for line for line in somefile:
L.append(line)
to put all lines of somefile into L,
but
L = []
K = [L.append(line) for line in somefile]
builds a list K that has a None for each line in
somefile, while filling up L with the lines as a side-effect.
It is a style to avoid. Dropping the "K = " part simply says
"build the list of Nones and then discard it." -- not good style.
Also, it is good style to then call somefile.close() after
you are done with the file.
--Scott David Daniels
[EMAIL PROTECTED]
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