【Python】方法和变量

今日学习：Exercise 19: Functions And Variables

              Exercise 20: Functions And Files

1.【Write at least one more function of your own design, and run it 10 different ways.】（不懂）

2.seek函数（不懂）

3.“=+” 用于循环结构

  e.g.

【

current_line = 1
while (current_line <= 3):
print_a_line(current_line, current_file)
current_line += 1

】