測試多項式‘2x^3+4x^2+8x-16‘下面的代碼輸出6、8作為區分多項式的系數。但是，輸出應該是6、8、8。為什么函數getNewCoEffents會產生錯誤的結果？什么是產生正確結果的好方法？def getNumbers(polynomial):

regex = re.compile(r"[+-]?\d+(?:\.\d+)?")

return regex.findall(polynomial)

def formatNumbers(numbers):

formattedNumbers = []

for e in numbers:

if (e[0] == '+'):

formattedNumbers.append(e[1:])

else:

formattedNumbers.append(e)

return formattedNumbers

def getNumberPositions(polynomial, numbers):

numberPositions = []

for e in numbers:

tmp = [m.start() for m in re.finditer(e, polynomial)]

for f in tmp:

if f not in numberPositions:

numberPositions.append(f)

return sorted(numberPositions)

def getNewCoefficients(polynomial, numberPositions, numbers):

tmp = '0'

newCoefficients = []

for i in range(0,len(numberPositions)):

if numberPositions[i] + 1 < len(polynomial):

if polynomial[numberPositions[i] + 1] == '+' or polynomial[numberPositions[i] + 1] == '-':

newCoefficients.append(int(numbers[i])*int(tmp))

elif numberPositions[i] - 1 > 0:

if polynomial[numberPositions[i] - 1] == '+' or polynomial[numberPositions[i] - 1] == '-':

newCoefficients.append(int(numbers[i]))

tmp = numbers[i]

return newCoefficients

總結

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