I want to iterate over each line of an entire file. One way to do this is by reading the entire file, saving it to a list, then going over the line of interest. This method uses a lot of memory, so I am looking for an alternative.
My code so far:
for each_line in fileinput.input(input_file):
for each_line_again in fileinput.input(input_file):
Nobody has given the correct, fully Pythonic way to read a file. It's the following:
with open(...) as f: for line in f: <do something with line>
with statement handles opening and closing the file, including if an exception is raised in the inner block. The
for line in f treats the file object
f as an iterable, which automatically uses buffered IO and memory management so you don't have to worry about large files.
There should be one -- and preferably only one -- obvious way to do it.