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from sys import argvscript, input_file = argvdef print_all(f):
print f.read()
#readline() 方法用于从文件读取整行，包括 "\n" 字符。如果指定了一个非负数的参数，则返回指定大小的字节数，包括 "\n" 字符。
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)
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