Type Hints for Globals

[dineshbvadhia]

The module this.py loads data from a function in module other.py. The data objects are loaded from a database and made global (I'm sure there is a better way to do this but hey ho). Placing a type hint inside the function or in the global statement cause the errors shown below. How are globals annotated?

this.py

import other

def get_data():
    other.read_data()

other.py

def read_data():
    global X, Y
    with some_db('db_file')) as db:
        X = db.read('x')
        Y = db.read('y'))

X: int = db.read('x')
SyntaxError: annotated name 'X' can't be global

global X: int
SyntaxError: invalid syntax

[srittau]

You can just define X: int in the global scope without an assignment:

X: int

def read_data():
    global X
    X = db_read()

[dineshbvadhia]

This works. Thank-you.

Related to this, why is

X: int, Y:int

not liked but

X: int
Y: int 

is liked?

[JelleZijlstra]

That's simply how the syntax was defined in PEP 526. I think your suggested syntax would have some ambiguity issues.