Exercise: Exception int conversion

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• In the earlier example we learned how to handle both ZeroDivisionError and FileNotFoundError exceptions. Now try this

cd examples/exceptions
python handle_both_exceptions.py one.txt zero.txt two.txt text.txt three.txt

before one.txt
100.0
after  one.txt

before zero.txt
Cannot divide by 0 in file 'zero.txt'

before two.txt
Cannot open file 'two.txt'

before text.txt
Traceback (most recent call last):
  File "handle_both_exceptions.py", line 9, in <module>
    module.read_and_divide(filename)
  File "/home/gabor/work/slides/python/examples/exceptions/module.py", line 4, in read_and_divide
    number = int(fh.readline())
ValueError: invalid literal for int() with base 10: '3.14\n'

• This will raise a ValueError exception before handling file three.txt
• Fix it by capturing the specific exception.
• Fix by capturing "all other exceptions".

examples/exceptions/text.txt

3.14