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fname = 'myfile.txt'
# Open the file for reading and read all lines into memory.
f = open(fname)
content = f.readlines()
# Modify the content arbitrarily. Here the new first line is inserted
# as the first line.
content.insert(0, 'inserted new first line\n')
# Join the lines from the list and write the resulting string
# to the same file now opened for writing.
f = open(fname, 'w')
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