fix some type annotations involving tuples

electrum/bitcoin.py

@@ -24,7 +24,7 @@
 # SOFTWARE.
 
 import hashlib
-from typing import List
+from typing import List, Tuple
 
 from .util import bfh, bh2u, BitcoinException, print_error, assert_bytes, to_bytes, inv_dict
 from . import version
@@ -433,7 +433,7 @@ def serialize_privkey(secret: bytes, compressed: bool, txin_type: str,
         return '{}:{}'.format(txin_type, base58_wif)
 
 
-def deserialize_privkey(key: str) -> (str, bytes, bool):
+def deserialize_privkey(key: str) -> Tuple[str, bytes, bool]:
     if is_minikey(key):
         return 'p2pkh', minikey_to_private_key(key), False
 

electrum/ecc.py

@@ -24,10 +24,8 @@
 # SOFTWARE.
 
 import base64
-import hmac
 import hashlib
-from typing import Union
+from typing import Union, Tuple
-
 
 import ecdsa
 from ecdsa.ecdsa import curve_secp256k1, generator_secp256k1
@@ -110,7 +108,7 @@ def get_y_coord_from_x(x: int, odd: bool=True) -> int:
     raise InvalidECPointException()
 
 
-def ser_to_point(ser: bytes) -> (int, int):
+def ser_to_point(ser: bytes) -> Tuple[int, int]:
     if ser[0] not in (0x02, 0x03, 0x04):
         raise ValueError('Unexpected first byte: {}'.format(ser[0]))
     if ser[0] == 0x04:
@@ -227,7 +225,7 @@ class ECPubkey(object):
     def get_public_key_hex(self, compressed=True):
         return bh2u(self.get_public_key_bytes(compressed))
 
-    def point(self) -> (int, int):
+    def point(self) -> Tuple[int, int]:
         return self._pubkey.point.x(), self._pubkey.point.y()
 
     def __mul__(self, other: int):

electrum/gui/qt/installwizard.py

@@ -3,6 +3,7 @@ import os
 import sys
 import threading
 import traceback
+from typing import Tuple
 
 from PyQt5.QtCore import *
 from PyQt5.QtGui import *
@@ -506,7 +507,7 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
 
     @wizard_dialog
     def choice_and_line_dialog(self, title, message1, choices, message2,
-                               test_text, run_next) -> (str, str):
+                               test_text, run_next) -> Tuple[str, str]:
         vbox = QVBoxLayout()
 
         c_values = [x[0] for x in choices]