Mike314 wrote:
Hello,
I have following code:
def test_func(val):
print type(val)
test_func(val=('val1'))
test_func(val=('val1', 'val2'))
The output is quite different:
<type 'str'>
<type 'tuple'>
Why I have string in the first case?
Because (<any expression>) == <any expression>.
Perhaps you meant ('val1',).
"Parenthesized forms
A parenthesized form is an optional expression list enclosed in parentheses:
parenth_form ::= "(" [expression_list] ")"
A parenthesized expression list yields whatever that expression list
yields: if the list contains at least one comma, it yields a tuple;
otherwise, it yields the single expression that makes up the expression
list.
An empty pair of parentheses yields an empty tuple object.
"
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