This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.
'''
【程序44】
题目：学习使用external的用法。
1.程序分析：
2.程序源代码：
external.py代码：
import external
if __name__ == '__main__':
print external.add(10,20)