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#!/usr/bin/env python
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import sys
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filename = sys.argv[1]
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with open(filename, "r") as fileobj:
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data = fileobj.read()
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max_linelength = 0
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for line in data.splitlines():
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max_linelength = max(max_linelength, len(line))
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print(f"The longest line has a length of {max_linelength}.")
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