misc. fixes for python3

gui/qt/main_window.py

@@ -1224,7 +1224,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         menu.exec_(self.from_list.viewport().mapToGlobal(position))
 
     def set_pay_from(self, coins):
-        self.pay_from = coins
+        self.pay_from = list(coins)
         self.redraw_from_list()
 
     def redraw_from_list(self):

gui/qt/util.py

@@ -470,7 +470,7 @@ class MyTreeWidget(QTreeWidget):
 
     def on_edited(self, item, column, prior):
         '''Called only when the text actually changes'''
-        key = str(item.data(0, Qt.UserRole).toString())
+        key = item.data(0, Qt.UserRole)
         text = item.text(column)
         self.parent.wallet.set_label(key, text)
         self.parent.history_list.update_labels()

lib/exchange_rate.py

@@ -46,7 +46,7 @@ class ExchangeBase(PrintError):
     def get_csv(self, site, get_string):
         url = ''.join(['https://', site, get_string])
         response = requests.request('GET', url, headers={'User-Agent' : 'Electrum'})
-        reader = csv.DictReader(response.content.split('\n'))
+        reader = csv.DictReader(response.content.decode().split('\n'))
         return list(reader)
 
     def name(self):

plugins/audio_modem/qt.py

@@ -57,7 +57,7 @@ class Plugin(BasePlugin):
             self.modem_config = amodem.config.bitrates[bitrate]
 
         combo = QComboBox()
-        combo.addItems(map(str, bitrates))
+        combo.addItems([str(x) for x in bitrates])
         combo.currentIndexChanged.connect(_index_changed)
         layout.addWidget(combo, 0, 1)
 

plugins/labels/labels.py

@@ -23,7 +23,7 @@ class LabelsPlugin(BasePlugin):
         password, iv, wallet_id = self.wallets[wallet]
         encrypted = electrum.bitcoin.aes_encrypt_with_iv(password, iv,
                                                          msg.encode('utf8'))
-        return base64.b64encode(encrypted)
+        return base64.b64encode(encrypted).decode()
 
     def decode(self, wallet, message):
         password, iv, wallet_id = self.wallets[wallet]