从python文档中,"set.pop()从s中删除并返回一个任意元素".在生成一些随机数据来测试程序时,我注意到这个pop()函数的奇怪行为.这是我的代码(python 2.7.3):
testCases = 10
numberRange = 500
poppedValues = []
greaterPercentages = []
for i in range (testCases):
s = Set()
""" inserting 100 random values in the set, in the range [0, numberRange) """
for j in range (100):
s.add(random.randrange(numberRange))
poppedValue = s.pop()
greaterCount = 0
""" counting how many numbers in the set are smaller then the popped value """
for number in s:
if poppedValue > number:
greaterCount += 1
poppedValues.append(poppedValue)
greaterPercentages.append(float(greaterCount) / len(s) …