我的问题

Question

请帮助我，我正在上一门在线课程，有人问我这个问题

分数部分函数将分子除以分母，只返回分数部分（0到1之间的数字）。完成函数体，使其返回正确的数字。 注意：由于除以0会产生错误，如果分母为0，则函数应返回0，而不是尝试进行除法

这是我的密码：

def fractional_part(numerator, denominator):
# Operate with numerator and denominator to 
# keep just the fractional part of the quotient
   if denominator == 0 or numerator == 0:
      print("0")
   else:
        fraction = numerator / denominator
        while fraction > 1:
           fraction1 = fraction - 1
   return fraction1

print(fractional_part(5, 5)) # Should be 0
print(fractional_part(5, 4)) # Should be 0.25
print(fractional_part(5, 3)) # Should be 0.66...
print(fractional_part(5, 2)) # Should be 0.5
print(fractional_part(5, 0)) # Should be 0
print(fractional_part(0, 5)) # Should be 0

这是我的输出：

UnboundLocalError:赋值前引用的局部变量“fraction1”

Answer 1

def fractional_part(numerator, denominator):
    # Operate with numerator and denominator to
    # keep just the fractional part of the quotient
    if denominator == 0:
        return 0 #raise Exception('Not possible')
    elif numerator == 0:
        return 0
    # check if result of division is already smaller than 1
    if numerator < denominator:
       return numerator / denominator

    remainder  = numerator % denominator
    return remainder / denominator

print(fractional_part(23, 5))
print(fractional_part(5, 4))

输出

0.6
0.25

Answer 2

如果将fraction1更改为fraction，将解决fraction1未定义的问题。然后，您需要在第一个if之后添加fraction = 0，以解决denominator或numerator是否为0

def fractional_part(numerator, denominator):
# Operate with numerator and denominator to 
# keep just the fractional part of the quotient
   if denominator == 0 or numerator == 0:
      fraction = 0 #to solve if denominator or numerator is 0
      print("0")
   else:
        fraction = numerator / denominator
        while fraction > 1:
           fraction = fraction - 1
   return fraction

Answer 3

您必须在代码中定义fraction1

您仅在while循环内创建fraction1变量，并且while循环仅在fraction > 1时运行

如果fraction <= 1怎么办？在代码的任何地方都没有创建任何名为fraction1的变量

最后，函数返回未定义的fraction1

此外，必须在循环内将fraction减少1，否则循环将无限期地继续下去

def fractional_part(numerator, denominator):
# Operate with numerator and denominator to 
# keep just the fractional part of the quotient
   if denominator == 0 or numerator == 0:
       return 0
   else:
       fraction = numerator / denominator
       fraction1 = 0
       while fraction > 1:
           fraction1 = fraction - 1
           fraction -= 1
       return fraction1