Which exceptions are recommended to me handled?

[Florencio Cano]

Hello,
Is it recommended as a good programming practice to catch all exceptions and
raise our own exceptions or let Python itself raise these kinds of
exceptions?
For example imagine a function that needs an integer and '34' is passed,
this is ok because inside the function it uses int(variable) but if a
'hello' is passed it will raise a ValueError exception.
Is it better to handle this exception or let Python raise directly
ValueError and stop execution or what is recommended?
Thanks
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