笨办法学Python（二十）

    回忆一下函数的要点，然后一边做这节练习，一边注意一下函数和文件是如何在一起协作发挥作用的。

 1 from sys import argv
 2 
 3 script, input_file = argv
 4 
 5 def print_all(f):
 6     print f.read()
 7 
 8 def rewind(f):
 9     f.seek(0)
10 
11 def print_a_line(line_count, f):
12     print line_count, f.readline()
13 
14 current_file = open(input_file)
15 
16 print "First let's print the whole file:\n"
17 
18 print_all(current_file)
19 
20 print "Now let's rewind, kind of like a tape."
21 
22 rewind(current_file)
23 
24 print "Let's print three lines:"
25 
26 current_line = 1
27 print_a_line(current_line, current_file)
28 
29 current_line = current_line + 1
30 print_a_line(current_line, current_file)
31 
32 current_line = current_line + 1
33 print_a_line(current_line, current_file)

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