我在這里使用類來輸入一個分數（當給定分子和分母時），以及將兩個分數相加和相乘。出于某種原因，導入的分數模塊只對程序的一部分正確工作；gcd方法工作，但是分數方法（當給定兩個數字時，放入分數格式）不工作，而是拋出一個NameError（特別是“未定義全局名稱‘分數’）。

我做錯什么了？我對Python還比較陌生，對于如何在出現更多異常的情況下使代碼更緊湊的建議，我將非常感激。

這是我的代碼：import fractions

class FractionClass:

# Initialize starting numerator and denominator.

n = 0

d = 0

def __init__(self, numerator, denominator):

self.n = numerator

self.d = denominator

# Function that adds fractions, whichs throws NameError if gcd() doesn't work!

def add_fractions(self, other):

try:

sum_numerator = self.n + other.n

sum_denominator = fractions.gcd(self.d, other.d)

return(sum_numerator, sum_denominator)

except NameError:

print("Methods aren't defined.")

# Function that multiplies fractions, whichs throws NameError if gcd() doesn't work!

def multiply_fractions(self, other):

try:

product_numerator = self.n * other.n

product_denominator = self.d * other.d

return(product_numerator, product_denominator)

except NameError:

print("Methods aren't defined.")

# Enter input function.

def user_input():

try:

print("Enter a numerator and denominator:")

n, d = [int(x) for x in input().split()]

print("Enter a numerator and denominator:")

n2, d2 = [int(x) for x in input().split()]

# Check used to debug for denominators that aren't the minimum of 1 (0 can't be divided!)

check = 1 / d

check = 1 / d2

# print(check)

# Exception for d = 0.

except ZeroDivisionError:

print("\n You didn't enter the minimum denominator.")

print("Set denominator to minimum default.")

d = 1

# Exception for not entering a space in between numbers.

except UnboundLocalError:

print("You didn't enter your numbers in properly! Try again.")

# Exception for not entering all required.

except NameError:

print("\n You didn't enter two numbers.")

# Exception for user input both or one of them, not being integers.

except TypeError:

print("\n You didn't enter all valid numbers.")

# General exception case.

except:

print("Something went wrong!")

fract = FractionClass(n,d)

another_fraction = FractionClass(n2, d2)

total_sum = fract.add_fractions(another_fraction)

# Unpacks total sum tuple.

# Puts in fraction format.

sum_numerator, sum_denominator = total_sum

add_output = fractions.Fraction(sum_numerator, sum_denominator)

total_product = fract.multiply_fractions(another_fraction)

# Unpacks product sum tuple.

# Puts in fraction format.

product_numerator, product_denominator = total_product

multiply_output = fractions.Fraction(product_numerator, product_denominator)

print(add_output, multiply_output)

總結

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