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錯誤已知 (經過廣泛測試後)
scores = []
while True:
number = int(input("Enter a number: "))
if number < 0:
break
scores.append(number)
sum = 0
for score in scores:
sum += score
print("average = ", sum / len(scores))
錯誤出現如預期(稀少)
def flatten(nested):
try:
# test whether nested is a string-like object
try:
nested + ''
except TypeError: # not string-like object
pass
else: # a string-like object
raise TypeError
for sublist in nested:
for element in flatten(sublist):
yield element
except TypeError:
yield nested
使用1: 輸出 [1, 2, 3, 4, 5, 6, 7, 8]]
list(flatten([[[1], 2], 3, 4, [5, [6, 7]], 8]]))
使用2: 輸出['foo', 'bar', 'baz']
list(flatten(['foo', ['bar', ['baz']]]))
錯誤無法避免
網路連接錯誤 ⇒ 等一下課程範例會有
檔案存取錯誤
import sys
try:
f = open('myfile.txt')
s = f.readline()
i = int(s.strip())
except OSError as err:
print("OS error:", err)
except ValueError:
print("Could not convert data to an integer.")
except Exception as err:
print(f"Unexpected {err=}, {type(err)=}")
raise
my_list = [1, 2, 3, "Four", 5, 6, 7]
for element in my_list:
result = 10 + element
print(result)
這裡因為"Four"是一個字串，因此在走訪到這個元素時，會把+這個運算子當成串接字串的運算。因此Python不知道怎麼把它跟10這個整數型的常數做運算，而會拋出
TypeError的例外
for element in my_list:
try:
result = 10 + element
print(result)
except:
print("{} is not a number.".format(element))