apihelper.py
def info(object, spacing=10, collapse=1):
"""Print methods and doc strings. Takes module, class, list, dictionary, or string."""
methodList = [e for e in dir(object) if callable(getattr(object, e))]
processFunc = collapse and (lambda s: " ".join(s.split())) or (lambda s: s)
print "\n".join(["%s %s" %
(method.ljust(spacing),
processFunc(str(getattr(object, method).__doc__)))
for method in methodList]) if __name__ == "__main__":
print help.__doc__
1、可选参数和命名参数
2、内置函数
type(obj)返回obj的数据类型
str(data)将数据强制转化为字符串
dir(obj)返回obj的属性和方法列表
callable(c)测试c是否可以调用
3、getattr()获取对象的引用
4、过滤列表
[mapping-expression for element in source-list if filter-expression]
5、and 和 or
and返回第一个假值，如果都为真，返回最后一个真值。
or返回第一个真值，如果都为假，返回最后一个假值。
>>> a = "first"
>>> b = "second"
>>> 1 and a or b 1
'first'
>>> 0 and a or b 2
'second'
类似于： bool ? a : b
安全使用：
>>> a = ""
>>> b = "second"
>>> (1 and [a] or [b])[0] 1
6、lambda表达式
测试代码
import unittest
import apihelper
import sys
from StringIO import StringIO class Redirector(unittest.TestCase):
def setUp(self):
self.savestdout = sys.stdout
self.redirect = StringIO()
sys.stdout = self.redirect def tearDown(self):
sys.stdout = self.savestdout class KnownValues(Redirector):
def testApiHelper(self):
"""info should return known result for apihelper"""
apihelper.info(apihelper)
self.redirect.seek(0)
self.assertEqual(self.redirect.read(),
"""info Print methods and doc strings. Takes module, class, list, dictionary, or string.
""") class ParamChecks(Redirector):
def testSpacing(self):
"""info should honor spacing argument"""
apihelper.info(apihelper, spacing=20)
self.redirect.seek(0)
self.assertEqual(self.redirect.read(),
"""info Print methods and doc strings. Takes module, class, list, dictionary, or string.
""") def testCollapse(self):
"""info should honor collapse argument"""
apihelper.info(apihelper, collapse=0)
self.redirect.seek(0)
self.assertEqual(self.redirect.read(),
"""info Print methods and doc strings. Takes module, class, list, dictionary, or string.
""")