我正在嘗試找到偶數(shù)和奇數(shù)列表的中位數(shù)。這是一個(gè)很長(zhǎng)的故事，但我必須以這種方式找到中位數(shù)（不導(dǎo)入任何東西）。當(dāng)我傳入 myOddList 作為參數(shù)時(shí)，中位數(shù)是 3（正確）。然而，當(dāng)我傳入 myEvenList 作為參數(shù)時(shí)，我再次得到 3。如何讓 myEvenList 正常工作并輸出 3.5？myOddList = [1, 2, 3, 4, 5]myEvenList = [1, 2, 3, 4, 5, 6]def medianCalculator(myEvenList): myOddList.sort() myEvenList.sort() n = len(myOddList) s = len(myEvenList) if n % 2 != 0: answerOdd = myOddList[int(n/2)] return answerOdd else: one = myEvenList [(s-1) // 2] two = myEvenList [(s+1) // 2] answerEven = (one + two) / 2 return answerEvenmedianForEvenList = medianCalculator(myEvenList)print(medianForEvenList)也許問(wèn)題是我沒(méi)有正確返回答案？
4 回答
FFIVE
TA貢獻(xiàn)1797條經(jīng)驗(yàn) 獲得超6個(gè)贊
問(wèn)題：
您正在訪(fǎng)問(wèn)
myEvenListandmyOddListinsidemedianCalculator，但您不應(yīng)該這樣做。medianCalculator應(yīng)與任何外部變量分離。參數(shù)
myEvenList隱藏myEvenList全局變量您決定運(yùn)行偶數(shù)還是奇數(shù)算法取決于
n，它是根據(jù) 計(jì)算的myOddList，因此它始終只運(yùn)行兩側(cè)之一。不要調(diào)用
sort()參數(shù)，因?yàn)樗鼤?huì)修改底層列表。先復(fù)印一份。
解決方案：
讓你的
medianCalculator函數(shù)沒(méi)有副作用。這意味著，它不應(yīng)該訪(fǎng)問(wèn)其自身函數(shù)之外的任何變量，而只能對(duì)其輸入?yún)?shù)進(jìn)行操作。medianCalculator如果您想獲得多個(gè)答案，請(qǐng)多次致電。使用不同的參數(shù)讓它在不同的輸入上運(yùn)行。
代碼：
myOddList = [1, 2, 3, 4, 5]
myEvenList = [1, 2, 3, 4, 5, 6]
def medianCalculator(myList):
myList = myList.copy()
myList.sort()
n = len(myList)
if n % 2 != 0:
answerOdd = myList[int(n/2)]
return answerOdd
else:
one = myList [(n-1) // 2]
two = myList [(n+1) // 2]
answerEven = (one + two) / 2
return answerEven
medianForEvenList = medianCalculator(myEvenList)
print(medianForEvenList)
medianForOddList = medianCalculator(myOddList)
print(medianForOddList)
慕容708150
TA貢獻(xiàn)1831條經(jīng)驗(yàn) 獲得超4個(gè)贊
myOddList = [1, 2, 3, 4, 5]
myEvenList = [1, 2, 3, 4, 5, 6]
def median(lst):
lst = sorted(lst)
lst_length = len(lst)
midpoint = lst_length/2
if lst_length % 2 != 0:
return lst[int(midpoint-0.5)]
else:
return (lst[int(midpoint-0.5)] + lst[int(midpoint+0.5)])/2
print(median(myOddList))
# 3
print(median(myEvenList))
# 3.5
BIG陽(yáng)
TA貢獻(xiàn)1859條經(jīng)驗(yàn) 獲得超6個(gè)贊
你得到 3 因?yàn)槟愫雎粤薽yEvenList
n = len(myOddList)
if n % 2 != 0: # always true
answerOdd = myOddList[int(n/2)]
return answerOdd # return 3
不要在函數(shù)中使用兩個(gè)列表，而只使用給定的參數(shù)
縹緲止盈
TA貢獻(xiàn)2041條經(jīng)驗(yàn) 獲得超4個(gè)贊
首先你創(chuàng)建一個(gè) def，所以不要在那里創(chuàng)建你的列表，其次你應(yīng)該定義一個(gè) def 參數(shù)，因?yàn)槟闵院笙胍褂谩?/p>
def median_cal (my_list) :
my_list.sort()
n = len(my_list)
if n % 2 != 0 :
x = int(n/2)
answer = my_list[x]
print (answer)
else :
x = int(n/2) - 1
y = int(n/2)
answer = my_list[x] + my_list[y]
print (answer/2)
a = [1,2,3]
b = [1,2,3,4]
median_cal(a)
median_cal(b)
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