fixed py37

btclib/alias.py

@@ -16,6 +16,8 @@
 from io import BytesIO
 from typing import Any, Callable, Tuple, Union
 
+from typing_extensions import TypeAlias
+
 # Octets are a sequence of eight-bit bytes or a hex-string (not text string)
 #
 # hex-strings are strings that can be converted to bytes using bytes.fromhex,
@@ -75,7 +77,7 @@
 
 # Elliptic curve point in affine coordinates.
 # Warning: to make Point a NamedTuple would slow down the code
-Point = Tuple[int, int]
+Point: TypeAlias = Tuple[int, int]
 
 # Note that the infinity point in affine coordinates is INF = (int, 0)
 # (no affine point has y=0 coordinate in a group of prime order).

btclib/script/script.py

@@ -374,7 +374,7 @@ class Script:
     def asm(self) -> List[Command]:
         return parse(self.script)
 
-    def __add__(self, other: object):
+    def __add__(self, other: object) -> object:
 
         return (
             Script(self.script + other.script)

btclib/to_prv_key.py

@@ -11,9 +11,11 @@
 "Functions for conversions between different private key formats."
 
 import contextlib
-from typing import Optional, Tuple, TypeAlias
+from typing import Optional, Tuple, Union
 
-from btclib.alias import String, Union
+from typing_extensions import TypeAlias
+
+from btclib.alias import String
 from btclib.base58 import b58decode
 from btclib.bip32 import BIP32Key, BIP32KeyData
 from btclib.ec import Curve, secp256k1

btclib/to_pub_key.py

@@ -11,7 +11,9 @@
 "Functions for conversions between different public key formats."
 
 import contextlib
-from typing import Optional, Tuple, TypeAlias, Union
+from typing import Optional, Tuple, Union
+
+from typing_extensions import TypeAlias
 
 from btclib.alias import Point
 from btclib.bip32 import BIP32Key, BIP32KeyData