http://woodpecker.org.cn/diveintopython/index.html
1.第一个程序odbchelper.py
1 def buildConnectionString(params): 2 """Build a connection string from a dictionary 3 4 Returns string. 5 """ 6 return ";".join(["%s=%s" % (k, v) for k, v in params.items()]) 7 8 if __name__ == "__main__": 9 myParams = {"server":"mpilgrim", \ 10 "database":"master", \ 11 "uid":"sa", \ 12 "pwd":"secret" 13 } 14 print buildConnectionString(myParams)关键点理解：
1.三重引号
"""Build a connection string from a dictionary Returns string. """常用于定义doc string，文档化python函数
2. ";".join(["%s=%s" % (k, v) for k, v in params.items()])
params.items()表明params必然是directory，调用items()方法返回键值对元组列表，利用多重赋值取出键值(k,v)元组，然后调用字符串对象的join方法将这些键值对用；隔开，join方法将list中的元素连接成单个字符串，打印的结果也就不再是列表的形式；注：join只能用于元素师字符串的list
运行结果为：server=mpilgrim;uid=sa;database=master;pwd=secret
附：split与join正好相反，它是将一个字符串分割成多元素list
>>>s.split(";") (1)
['server=mpilgrim', 'uid=sa', 'database=master', 'pwd=secret']
3.if __name__ == "__main__":用于测试模块
2.自省apihelper.py
1 def info(object, spacing=10, collapse=1): 2 """Print methods and doc strings. 3 4 Takes module, class, list, dictionary, or string.""" 5 methodList = [e for e in dir(object) if callable(getattr(object, e))] 6 processFunc = collapse and (lambda s: " ".join(s.split())) or (lambda s: s) 7 print "\n".join(["%s %s" % 8 (method.ljust(spacing), 9 processFunc(str(getattr(object, method).__doc__))) 10 for method in methodList]) 11 12 if __name__ == "__main__": 13 print help.__doc__
转载于:https://www.cnblogs.com/CoolRandy/p/3298897.html
