On 5/3/2018 8:41 AM, Robert Roskam wrote:
However, I don't see that the conversation ever really resolved, so I'd
like restart the conversation on some kind of pattern matching syntax in
Python.
For the cases not handled by dicts, I believe chained conditional
expressions work.
"""
# Pattern matching with guards
x = 'three'
number = match x:
1 => "one"
y if y is str => f'The string is {y}'
_ => "anything"
print(number) # The string is three
"""
Is handled by
def f(x):
return ('one' if x == 1 else
f'The string is {x}' if isinstance(x, str) else
'anything')
for x in 1, '2', 3: print(f(x))
I don't like the ordering, but this was Guido's decision.
> 1, 2, 3, 4 => "one to four"
"one to four' if x in (1,2,3,4)
> x:int => f'{x} is a int'
> x:float => f'{x} is a float'
> x:str => f'{x} is a string'
tx = type(x)
f'{x} is a {tx}' if tx in (int, float, str) else None
--
Terry Jan Reedy
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