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Copy pathwendangceshi.py
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93 lines (74 loc) · 1.62 KB
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def abs(n):
'''
Function to get absolute value of number.
Examp:
>>> abs(1)
1
>>> abs(-1)
1
>>> abs(0)
0
'''
return n if n>=0 else (-n)
#用doctest测试Dict
#两个地方可以放doctest测试用例，一个位置是模块的最开头，
#另一个位置是函数声明语句的下一行
class Dict(dict):
#以下>>>后面有空格，Traceback和KeyError：后面空格也要加上
'''
Simple dict but also support access as x.y style.
>>> d1 = Dict()
>>> d1['x'] = 100
>>> d1.x
100
>>> d1.y = 200
>>> d1['y']
200
>>> d2 = Dict(a=1,b=2,c='3')
>>> d2.c
'3'
>>> d2['empty']
Traceback (most recent call last):
...
KeyError: 'empty'
>>> d2.empty
Traceback (most recent call last):
...
AttributeError: 'Dict' object has no attribute 'empty'
'''
def __init__(self,**kw):
super(Dict,self).__init__(**kw)
def __getattr__(self,key):
try:
return self[key]
except KeyError:
raise AttributeError(r"'Dict' object has no attribute '%s'"%key)
def __setattr__(self,key,value):
self[key]=value
# if __name__=='__main__':
# import doctest
# 默认testmod()是verbose=false，为true时打印出来
# doctest.testmod()
#练习: 对函数fact(n)编写doctest并执行：
def fact(n):
'''
Calculate 1*2*...*n
>>> fact(1)
1
>>> fact(10)
3628800
>>> fact(-1)
Traceback (most recent call last):
...
ValueError
'''
if n<1:
raise ValueError()
if n==1:
return 1
return n*(fact(n-1))
# print(fact(-1))
if __name__=='__main__':
import doctest
doctest.testmod(verbose=True)
#使用doctest时会把对应地方'''...'''中的注释>>> 的代码尝试以shell方式运行来测试