vch wrote:
> Does a call to file.readlines() reads all lines at once in the memory?
> Are the any reasons, from the performance point of view, to prefer
> *while* loop with readline() to *for* loop with readlines()?
Yes, and you just mentioned it. .readlines reads the entire file into
memory at once, which can obviously be expensive if the file is large.
A for loop with .readline, of course, will work, but modern versions of
Python allow iteration over a file, which will read it line by line:
for line in aFile:
...
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