Erik Max Francis wrote:
>> To do this efficiently on a large file (dozens or hundreds of megs), you
>> should use the
>> 'sizehint' parameter so as not to use too much memory:
>>
>> sizehint = 0
>> mylist = f.readlines(sizehint)
>
> It doesn't make any difference. .readlines reads the entire file into memory
> at once.
except when it doesn't:
readlines([sizehint])
Read until EOF using readline() and return a list containing the
lines thus read. If the optional sizehint argument is present, instead
of reading up to EOF, whole lines totalling approximately sizehint
bytes (possibly after rounding up to an internal buffer size) are read.
Objects implementing a file-like interface may choose to ignore
sizehint if it cannot be implemented, or cannot be implemented
efficiently.
>>> f = open("ot.xml")
>>> s = f.readlines(1000)
>>> len(s)
157
>>> f = open("ot.xml")
>>> s = f.readlines()
>>> len(s)
48560
</F>
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