Open file and read line by line

Open files:
ifile = open( infilename, 'r')  # r for reading
ofile = open(outfilename, 'w')  # w for writing

afile = open(appfilename, 'a')  # a for appending
Read line by line:
for line in ifile:
    # process line
Observe: blocks are indented; no braces!

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