我正在尝试编写一个函数来计算牛顿方法。期待我的代码中不断出现错误。这是提示我为
这是我写下的代码
import math
def newton(x):
tolerance = 0.000001
estimate = 1.0
while True:
estimate = (estimate + x / estimate) / 2
difference = abs(x - estimate ** 2)
if difference <= tolerance:
break
return estimate
def main():
while True:
x = input("Enter a positive number or enter/return to quit: ")
if x == '':
break
x = float(x)
print("The program's estimate is", newton(x))
print("Python's estimate is ", math.sqrt(x))
main()
它似乎正在工作,但是在对Cengage进行检查时我一直收到此错误
我不太确定这意味着什么,因为我的代码似乎运行得很好。有人可以帮忙解释一下吗?
输入为空白时,似乎会出现此问题。假设您只想使用正数作为输入,一个可能的解决方法是设置一个负数(或其他任何选择),例如-1作为退出条件:
x = input("Enter a positive number or enter/return to quit: ")
if not x:
break
x = float(x)
This should avoid the EOFError
.
If you want to use a blank input (hitting the return line) to break out of the loop, you can try this alternative syntax:
x = input("Enter a positive number or enter/return to quit: ")
if not x:
break
x = float(x)
The not x
checks if x
is blank. It is also more pythonic than x == ""
. Additional methods to detect a blank input are in this post as well: How do you get Python to detect for no input.
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