Type Hints Syntax

[YoSTEALTH]

BPO	28861
Nosy	@YoSTEALTH

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-12-04.01:40:01.006>
created_at = <Date 2016-12-03.20:48:45.049>
labels = ['type-feature']
title = 'Type Hints Syntax'
updated_at = <Date 2016-12-04.01:40:00.992>
user = 'https://github.com/YoSTEALTH'

bugs.python.org fields:

activity = <Date 2016-12-04.01:40:00.992>
actor = 'YoSTEALTH'
assignee = 'none'
closed = True
closed_date = <Date 2016-12-04.01:40:01.006>
closer = 'YoSTEALTH'
components = []
creation = <Date 2016-12-03.20:48:45.049>
creator = 'YoSTEALTH'
dependencies = []
files = []
hgrepos = []
issue_num = 28861
keywords = []
message_count = 2.0
messages = ['282304', '282313']
nosy_count = 1.0
nosy_names = ['YoSTEALTH']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue28861'
versions = []

[YoSTEALTH]

Type Hints Syntax
-----------------

Goal: Is to make it easy to read function/methods arguments, yet keep the new and cool Type Hints.

For example this is a code from one of my function. Its getting to that point of what the heck is going on here?

def find_replace(string: str, find: (str, dict, list, tuple, set), replace: (str, list, tuple, set)='') -> str:
    pass

I know it can be rewritten as:

T = (str, dict, list, tuple, set)
def find_replace(string: str, find: T, replace: T='') -> str:
    pass

But when you start using variable to represent another variables type... maybe we are losing the plot here!

What if we could have both? Readability and type reference, what if it could be written as:

def find_replace(string, find, replace):
    targ str, *(str, dict, list, tuple, set) -> str
    # code here ...

targ = type argument (like *args and **kwargs)

Calling a "targ" like we call "global" but to represent types.

Simple Examples:

def Redirect(url='', code=301):
    targ (str, int) -> None

Just think about it...

[YoSTEALTH]

I was told to post this in python-ideas and also i totally missed the most important part (type aliases) in my example (rushed it)