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- 难度级别: 简单
注意: 所有程序都在 python 版本 3 及更高版本上运行。
1)以下程序的输出是什么?
data = 50
try:
data = data/0
except ZeroDivisionError:
print('Cannot divide by 0 ', end = '')
else:
print('Division successful ', end = '')
try:
data = data/5
except:
print('Inside except block ', end = '')
else:
print('HY', end = '')
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a) Cannot divide by 0 HY
b) Cannot divide by 0
c) Cannot divide by 0 Inside except block HY
d) Cannot divide by 0 Inside except block
答: (a)
说明: else 代码块只有在 try 块没有发生异常时才会执行。
2) 以下程序的输出是什么?
data = 50
try:
data = data/10
except ZeroDivisionError:
print('Cannot divide by 0 ', end = '')
finally:
print('Haiyong ', end = '')
else:
print('Division successful ', end = '')
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a) Runtime error
b) Cannot divide by 0 Haiyong
c) Haiyong Division successful
d) Haiyong
答: (a)
解释: python 中不允许 finally 块后面的 else 块。使用这种格式时,Python 会抛出语法错误。
3) 以下程序的输出是什么?
value = [1, 2, 3, 4]
data = 0
try:
data = value[4]
except IndexError:
print('HY', end = '')
except:
print('Haiyong ', end = '')
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a) Haiyong
b) HY
c) HY Haiyong
d) 编译错误
答: (b)
解释: 一次只捕获一个异常,即使try 块中的throw 异常很可能属于多个异常类型。
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4) 以下程序的输出是什么?
value = [1, 2, 3, 4]
data = 0
try:
data = value[3]
except IndexError:
print('HY IndexError ', end = '')
except:
print('Haiyong IndexError ', end = '')
finally:
print('Hai IndexError ', end = '')
data = 10
try:
data = data/0
except ZeroDivisionError:
print('HY ZeroDivisionError ', end = '')
finally:
print('Hai ZeroDivisionError ')
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a) HY ZeroDivisionError HY ZeroDivisionError
b) HY ZeroDivisionError Hai ZeroDivisionError
c) Hai IndexError HY ZeroDivisionError Hai ZeroDivisionError
d) Hai IndexError HY ZeroDivisionError
答: (c)
解释: 无论是否发生异常,finally 代码块总是被执行。如果发生异常,则先执行 except 块,然后执行 finally 块。
5) 以下程序的输出是什么?
value = [1, 2, 3, 4, 5]
try:
value = value[5]/0
except (IndexError, ZeroDivisionError):
print('Haiyong ', end = '')
else:
print('HY', end = '')
finally:
print('Hai ', end = '')
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a) Compilation error
b) Runtime error
c) Haiyong HY Hai
d) Haiyong Hai
答: (d)
解释: python 中定义了 try 之间的 finally 块之间的 else 块。如果 try 块中没有异常,则执行 else,然后执行 finally 块。可以定义一个except块来捕获多个异常。