Python 如何修复“除了 ValueError”的无效语法错误？
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时间：2020-08-18 19:23:54 来源:igfitidea点击:
How to fix invalid syntax error at 'except ValueError'?
提问by Sabri Gül
I'm trying to write a simple exception handling. However it seems I'm doing something wrong.
我正在尝试编写一个简单的异常处理。但是，我似乎做错了什么。
def average():
TOTAL_VALUE = 0
FILE = open("Numbers.txt", 'r')
for line in FILE:
AMOUNT = float(line)
TOTAL_VALUE += AMOUNT
NUMBERS_AVERAGE = TOTAL_VALUE / AMOUNT
print("the average of the numbers in 'Numbers.txt' is :",
format(NUMBERS_AVERAGE, '.2f'))
FILE.close()
except ValueError,IOError as err:
print(err)
average()
> line 14
> except ValueError as err:
> ^
> SyntaxError: invalid syntax
采纳答案by Sabri Gül
There are two things wrong here. First, You need parenthesis to enclose the errors:
这里有两件事不对。首先，您需要括号来包含错误：
except (ValueError,IOError) as err:
Second, you need a tryto go with that exceptline:
其次，您需要try使用该except行：
def average():
try:
TOTAL_VALUE = 0
FILE = open("Numbers.txt", 'r')
for line in FILE:
AMOUNT = float(line)
TOTAL_VALUE += AMOUNT
NUMBERS_AVERAGE = TOTAL_VALUE / AMOUNT
print("the average of the numbers in 'Numbers.txt' is :",
format(NUMBERS_AVERAGE, '.2f'))
FILE.close()
except (ValueError,IOError) as err:
print(err)
exceptcannot be used without try.
except不能没有try.
