python中的all和any使用示例

电玩女神 2022-05-31 02:41 202阅读 0赞

分别用python2.7和3.5测过，结果是一样的，具体如下——

In \[1\]: a=True; b= True; c=False  
In \[2\]: abc=(a,b,c)  
  
In \[3\]: any(abc) \# 序列中只需要一个元素为True, 结果即为True  
Out\[3\]: True  
  
In \[4\]: all(abc) \# 序列中必须所有元素为True, 结果为True，但是也有例外，请看下面  
Out\[4\]: False  
  
In \[5\]: all(()) \# 注意，对空序列求all()会得到True  
Out\[5\]: True  
In \[6\]: any(())  
Out\[6\]: False

In \[7\]: all((True))  
\---------------------------------------------------------------------------  
TypeError Traceback (most recent call last)  
<ipython-input-7-96d59bf9da00> in <module>()  
\----> 1 all((True))  
TypeError: 'bool' object is not iterable  
  
In \[8\]: all((True,))\# all(iterable\_object) 只对可迭代对象(例如序列)起作用  
Out\[8\]: True  
  
In \[9\]: any((True))  
\---------------------------------------------------------------------------  
TypeError Traceback (most recent call last)  
<ipython-input-9-01378c2303c5> in <module>()  
\----> 1 any((True))  
TypeError: 'bool' object is not iterable  
  
In \[10\]: any((True,)) \# any(iterable\_object) 只对可迭代对象(例如序列)起作用  
Out\[10\]: True

In \[11\]: result\_1 = 2<1

In \[12\]: result\_2 = -1 > -2  
In \[13\]: result\_3 = 0  
In \[14\]: result\_4 = ""  
In \[15\]: result\_5 = \[\]  
In \[16\]: result\_6 = ()  
In \[17\]: group\_1 = (result\_1, result\_2, result\_3, result\_4, result\_5, result\_6)

In \[20\]: all(group\_1)

Out\[20\]: False  
In \[21\]: any(group\_1)  
Out\[21\]: True

In \[22\]: group\_2 = (result\_3, result\_4, result\_5, result\_6)  
In \[23\]: for x in group\_2: print (x,)  
0  
  
\[\]  
()

In \[24\]: all(group\_2)  
Out\[24\]: False  
In \[25\]: any(group\_2)  
Out\[25\]: False

In \[26\]: \# 测试含有非零元素的序列

In \[27\]: test\_seq = (-1,0,\[\])  
  
In \[28\]: all(test\_seq)\# 结论：0、False、空序列都会被认为是“假”  
Out\[28\]: False  
In \[29\]: any(test\_seq)\# -1不在“假”的条件范围内，所以结果为真  
Out\[29\]: True