fix larray-project#864 : added type hints for returned objects from functions and methods.

Author: alixdamman

larray/core/array.py

@@ -1,17 +1,17 @@
 import numpy as np
 
 
-nan = np.nan
+nan: float = np.nan
 r"NaN (Not a Number)"
 
-inf = np.inf
+inf: float = np.inf
 r":math:`\infty` (infinite)"
 
-pi = np.pi
+pi: float = np.pi
 r":math:`\pi`"
 
-e = np.e
+e: float = np.e
 r":math:`e`"
 
-euler_gamma = np.euler_gamma
+euler_gamma: float = np.euler_gamma
 r"Euler's :math:`\gamma`"

larray/core/axis.py

@@ -70,7 +70,7 @@ def expr_eval(expr, context):
 
 
 class BinaryOp(ExprNode):
-    def __init__(self, op, expr1, expr2):
+    def __init__(self, op, expr1, expr2) -> None:
         self.op = op
         self.expr1 = expr1
         self.expr2 = expr2
@@ -83,7 +83,7 @@ def evaluate(self, context):
 
 
 class UnaryOp(ExprNode):
-    def __init__(self, op, expr):
+    def __init__(self, op, expr) -> None:
         self.op = op
         self.expr = expr