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sami/learn-python-the-hard-way/ex20.py

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+from sys import argv
+
+
+script, input_file = argv
+
+
+
+def print_all(f):
+print(f.read())
+
+
+
+def rewind(f):
+f.seek(0)
+
+
+
+def print_a_line(line_count, f):
+print(line_count, f.readline())
+
+
+current_file = open(input_file)
+
+
+print("First let's print the whole file:\n")
+
+
+print_all(current_file)
+
+
+print("Now let's rewind, kind of like a tape.")
+
+
+rewind(current_file)
+
+
+print("Let's print three lines:")
+
+current_line = 1
+print_a_line(current_line, current_file)
+
+current_line = current_line + 1
+print_a_line(current_line, current_file)
+
+current_line = current_line + 1
+print_a_line(current_line, current_file)