diff --git a/src/addresses.py b/src/addresses.py
index a55fc415..c0903841 100644
--- a/src/addresses.py
+++ b/src/addresses.py
@@ -158,7 +158,7 @@ def encodeAddress(version, stream, ripe):
             raise Exception(
                 'Programming error in encodeAddress: The length of'
                 ' a given ripe hash was not 20.')
-        ripe = ripe.lstrip('\x00')
+        ripe = ripe.lstrip('\x00'.encode('utf-8'))
 
     storedBinaryData = encodeVarint(version) + encodeVarint(stream) + ripe
 
@@ -264,7 +264,8 @@ def decodeAddress(address):
             return 'ripetoolong', 0, 0, ''
         elif len(embeddedRipeData) < 4:
             return 'ripetooshort', 0, 0, ''
-        x00string = '\x00' * (20 - len(embeddedRipeData))
+        x00string = '\x00'.encode('utf-8') * (20 - len(embeddedRipeData))
+
         return status, addressVersionNumber, streamNumber, \
             x00string + embeddedRipeData
 
diff --git a/src/bitmessagekivy/main.kv b/src/bitmessagekivy/main.kv
index 18f1ac6a..93d12393 100644
--- a/src/bitmessagekivy/main.kv
+++ b/src/bitmessagekivy/main.kv
@@ -334,7 +334,6 @@ NavigationLayout:
             BoxLayout:
                 AnchorLayout:
                     MDRaisedButton:
-                        size_hint: .6, .35
                         height: dp(40)
                         MDLabel:
                             font_style: 'H4'
@@ -383,7 +382,6 @@ NavigationLayout:
                 txt_input: txt_input
                 rv: rv
                 size : (890, 60)
-                size_hint: 1,1
                 MyTextInput:
                     id: txt_input
                     size_hint_y: None
@@ -414,7 +412,6 @@ NavigationLayout:
                 spacing:50
                 AnchorLayout:
                     MDRaisedButton:
-                        size_hint: 1, None
                         height: dp(40)
                         on_press: root.reset_composer()
                         MDLabel:
@@ -512,7 +509,6 @@ NavigationLayout:
             BoxLayout:
                 AnchorLayout:
                     MDRaisedButton:
-                        size_hint: .5, .35
                         height: dp(40)
                         on_press: app.root.ids.scr_mngr.current = 'random'
                         MDLabel:
@@ -556,7 +552,6 @@ NavigationLayout:
             BoxLayout:
                 AnchorLayout:
                     MDRaisedButton:
-                        size_hint: .5, None
                         height: dp(40)
                         on_release: root.generateaddress(app)
                         opposite_colors: True
@@ -586,7 +581,6 @@ NavigationLayout:
             BoxLayout:
                 AnchorLayout:
                     MDRaisedButton:
-                        size_hint: .6, .55
                         height: dp(40)
                         MDLabel:
                             font_style: 'H4'
@@ -599,7 +593,6 @@ NavigationLayout:
             BoxLayout:
                 AnchorLayout:
                     MDRaisedButton:
-                        size_hint: .6, .55
                         height: dp(40)
                         MDLabel:
                             font_style: 'H4'
@@ -612,7 +605,6 @@ NavigationLayout:
             BoxLayout:
                 AnchorLayout:
                     MDRaisedButton:
-                        size_hint: .6, .55
                         height: dp(40)
                         MDLabel:
                             font_style: 'H4'
@@ -633,7 +625,6 @@ NavigationLayout:
             BoxLayout:
                 MDCheckbox:
                     id:            chkbox
-                    size_hint:    None, None
                     size:        dp(48), dp(64)
                     active: True
                 MDLabel:
@@ -718,7 +709,6 @@ NavigationLayout:
                         Rectangle:
                             pos: self.pos
                             size: self.size
-                    size_hint: 1, None
                     height: dp(40)
                     on_press: root.get_available_credits(self)
                     MDLabel:
@@ -763,7 +753,6 @@ NavigationLayout:
                         Rectangle:
                             pos: self.pos
                             size: self.size
-                    size_hint: 1, None
                     height: dp(40)
                     MDLabel:
                         font_style: 'H4'
@@ -807,7 +796,6 @@ NavigationLayout:
                         Rectangle:
                             pos: self.pos
                             size: self.size
-                    size_hint: 1, None
                     height: dp(40)
                     MDLabel:
                         font_style: 'H4'
@@ -819,7 +807,6 @@ NavigationLayout:
 
 <GrashofPopup>:
     id: popup
-    size_hint : (None,None)
     height: 2*(label.height + address.height) + 10
     width :app.window_size[0] - app.window_size[0]/10
     title: 'add contact\'s'
@@ -852,7 +839,6 @@ NavigationLayout:
             orientation: 'horizontal'
             MDRaisedButton:
                 id: save_addr
-                size_hint: 1.5, None
                 height: dp(40)
                 on_release:                 
                     root.savecontact()
@@ -863,7 +849,6 @@ NavigationLayout:
                     color: (1,1,1,1)
                     halign: 'center'
             MDRaisedButton:
-                size_hint: 1.5, None
                 height: dp(40)
                 on_press: root.dismiss()
                 on_press: root.close_pop()
@@ -874,7 +859,6 @@ NavigationLayout:
                     color: (1,1,1,1)
                     halign: 'center'
             MDRaisedButton:
-                size_hint: 2, None
                 height: dp(40)
                 MDLabel:
                     font_style: 'H4'
@@ -965,7 +949,6 @@ NavigationLayout:
 
 <MyaddDetailPopup>:
     id: myadd_popup
-    size_hint : (None,None)
     height: 4.5*(myaddr_label.height+ my_add_btn.children[0].height)
     width :app.window_size[0] - app.window_size[0]/10
     background: './images/popup.jpeg'
@@ -1010,7 +993,6 @@ NavigationLayout:
             spacing:5
             orientation: 'horizontal'
             MDRaisedButton:
-                size_hint: 2, None
                 height: dp(40)
                 on_press: root.send_message_from()
                 MDLabel:
@@ -1020,7 +1002,6 @@ NavigationLayout:
                     color: (1,1,1,1)
                     halign: 'center'
             MDRaisedButton:
-                size_hint: 1.5, None
                 height: dp(40)
                 on_press: root.dismiss()
                 on_press: app.root.ids.scr_mngr.current = 'showqrcode'
@@ -1032,7 +1013,6 @@ NavigationLayout:
                     color: (1,1,1,1)
                     halign: 'center'
             MDRaisedButton:
-                size_hint: 1.5, None
                 height: dp(40)
                 on_press: root.dismiss()
                 on_press: root.close_pop()
@@ -1045,7 +1025,6 @@ NavigationLayout:
 
 <AddbookDetailPopup>:
     id: addbook_popup
-    size_hint : (None,None)
     height: 4*(add_label.height)
     width :app.window_size[0] - app.window_size[0]/10
     background: './images/popup.jpeg'
@@ -1092,7 +1071,6 @@ NavigationLayout:
             spacing:5
             orientation: 'horizontal'
             MDRaisedButton:
-                size_hint: 2, None
                 height: dp(40)
                 on_press: root.send_message_to()
                 MDLabel:
@@ -1102,7 +1080,6 @@ NavigationLayout:
                     color: (1,1,1,1)
                     halign: 'center'
             MDRaisedButton:
-                size_hint: 1.5, None
                 height: dp(40)
                 font_size: '10sp'
                 on_press: root.update_addbook_label(root.address)
@@ -1113,7 +1090,6 @@ NavigationLayout:
                     color: (1,1,1,1)
                     halign: 'center'
             MDRaisedButton:
-                size_hint: 1.5, None
                 height: dp(40)
                 on_press: root.dismiss()
                 on_press: root.close_pop()
diff --git a/src/class_addressGenerator.py b/src/class_addressGenerator.py
index b5c0cbcd..e4bf1d13 100644
--- a/src/class_addressGenerator.py
+++ b/src/class_addressGenerator.py
@@ -29,7 +29,6 @@ class addressGenerator(StoppableThread):
         super(addressGenerator, self).stopThread()
 
     def run(self):
-
         while state.shutdown == 0:
             queueValue = queues.addressGeneratorQueue.get()
             nonceTrialsPerByte = 0
@@ -134,7 +133,7 @@ class addressGenerator(StoppableThread):
                     ripe = RIPEMD160Hash(sha.digest()).digest()
                     if (
                         ripe[:numberOfNullBytesDemandedOnFrontOfRipeHash] ==
-                        '\x00' * numberOfNullBytesDemandedOnFrontOfRipeHash
+                            '\x00'.encode('utf-8') * numberOfNullBytesDemandedOnFrontOfRipeHash
                     ):
                         break
                 logger.info(
@@ -151,19 +150,20 @@ class addressGenerator(StoppableThread):
                     # The user must have a pretty fast computer.
                     # time.time() - startTime equaled zero.
                     pass
+
                 address = encodeAddress(
                     addressVersionNumber, streamNumber, ripe)
 
                 # An excellent way for us to store our keys
                 # is in Wallet Import Format. Let us convert now.
                 # https://en.bitcoin.it/wiki/Wallet_import_format
-                privSigningKey = '\x80' + potentialPrivSigningKey
+                privSigningKey = '\x80'.encode('utf-8') + potentialPrivSigningKey
                 checksum = hashlib.sha256(hashlib.sha256(
                     privSigningKey).digest()).digest()[0:4]
                 privSigningKeyWIF = arithmetic.changebase(
                     privSigningKey + checksum, 256, 58)
 
-                privEncryptionKey = '\x80' + potentialPrivEncryptionKey
+                privEncryptionKey = '\x80'.encode('utf-8') + potentialPrivEncryptionKey
                 checksum = hashlib.sha256(hashlib.sha256(
                     privEncryptionKey).digest()).digest()[0:4]
                 privEncryptionKeyWIF = arithmetic.changebase(
diff --git a/src/class_singleCleaner.py b/src/class_singleCleaner.py
index 9a2916c7..de7508ef 100644
--- a/src/class_singleCleaner.py
+++ b/src/class_singleCleaner.py
@@ -143,8 +143,8 @@ class singleCleaner(StoppableThread):
 
             # inv/object tracking
             for connection in \
-                    BMConnectionPool().inboundConnections.values() + \
-                    BMConnectionPool().outboundConnections.values():
+                    list(BMConnectionPool().inboundConnections.values()) + \
+                    list(BMConnectionPool().outboundConnections.values()):
                 connection.clean()
 
             # discovery tracking
diff --git a/src/network/bmproto.py b/src/network/bmproto.py
index 813d5b97..cfd6672f 100644
--- a/src/network/bmproto.py
+++ b/src/network/bmproto.py
@@ -86,7 +86,7 @@ class BMProto(AdvancedDispatcher, ObjectTracker):
         """Process incoming header"""
         self.magic, self.command, self.payloadLength, self.checksum = \
             protocol.Header.unpack(self.read_buf[:protocol.Header.size])
-        self.command = self.command.rstrip('\x00')
+        self.command = self.command.rstrip('\x00'.encode('utf-8'))
         if self.magic != 0xE9BEB4D9:
             # skip 1 byte in order to sync
             self.set_state("bm_header", length=1)
diff --git a/src/network/connectionpool.py b/src/network/connectionpool.py
index adc8cf51..aad45e59 100644
--- a/src/network/connectionpool.py
+++ b/src/network/connectionpool.py
@@ -328,8 +328,8 @@ class BMConnectionPool(object):
 
         reaper = []
         for i in (
-                self.inboundConnections.values() +
-                self.outboundConnections.values()
+                list(self.inboundConnections.values()) +
+                list(self.outboundConnections.values())
         ):
             minTx = time.time() - 20
             if i.fullyEstablished:
@@ -342,10 +342,10 @@ class BMConnectionPool(object):
                         time.time() - i.lastTx)
                     i.set_state("close")
         for i in (
-                self.inboundConnections.values() +
-                self.outboundConnections.values() +
-                self.listeningSockets.values() +
-                self.udpSockets.values()
+                list(self.inboundConnections.values()) +
+                list(self.outboundConnections.values()) +
+                list(self.listeningSockets.values()) +
+                list(self.udpSockets.values())
         ):
             if not (i.accepting or i.connecting or i.connected):
                 reaper.append(i)
diff --git a/src/network/dandelion.py b/src/network/dandelion.py
index e51df5d1..2c23da5d 100644
--- a/src/network/dandelion.py
+++ b/src/network/dandelion.py
@@ -7,7 +7,7 @@ from random import choice, sample, expovariate
 from threading import RLock
 from time import time
 
-import network.connectionpool
+from network import connectionpool
 import state
 from debug import logging
 from queues import invQueue
@@ -182,8 +182,8 @@ class Dandelion():      # pylint: disable=old-style-class
             try:
                 # random two connections
                 self.stem = sample(
-                    connectionpool.BMConnectionPool(
-                    ).outboundConnections.values(), MAX_STEMS)
+                    list(connectionpool.BMConnectionPool(
+                    ).outboundConnections.values()), MAX_STEMS)
             # not enough stems available
             except ValueError:
                 self.stem = connectionpool.BMConnectionPool(
diff --git a/src/network/tcp.py b/src/network/tcp.py
index 31346e22..3ed19462 100644
--- a/src/network/tcp.py
+++ b/src/network/tcp.py
@@ -362,7 +362,7 @@ class TCPServer(AdvancedDispatcher):
     """TCP connection server for Bitmessage protocol"""
 
     def __init__(self, host='127.0.0.1', port=8444):
-        if not hasattr(self, '_map'):
+        if not '_map' in dir(self):
             AdvancedDispatcher.__init__(self)
         self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
         self.set_reuse_addr()
diff --git a/src/protocol.py b/src/protocol.py
index 1031b950..abb310db 100644
--- a/src/protocol.py
+++ b/src/protocol.py
@@ -94,9 +94,9 @@ def isBitSetWithinBitfield(fourByteString, n):
 def encodeHost(host):
     """Encode a given host to be used in low-level socket operations"""
     if host.find('.onion') > -1:
-        return '\xfd\x87\xd8\x7e\xeb\x43' + base64.b32decode(host.split(".")[0], True)
+        return '\xfd\x87\xd8\x7e\xeb\x43'.encode('utf-8') + base64.b32decode(host.split(".")[0], True)
     elif host.find(':') == -1:
-        return '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF' + \
+        return '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF'.encode('utf-8') + \
             socket.inet_aton(host)
     return socket.inet_pton(socket.AF_INET6, host)
 
diff --git a/src/pyelliptic/arithmetic.py b/src/pyelliptic/arithmetic.py
index f5106768..1c9dcec4 100644
--- a/src/pyelliptic/arithmetic.py
+++ b/src/pyelliptic/arithmetic.py
@@ -39,11 +39,13 @@ def get_code_string(base):
 
 def encode(val, base, minlen=0):
     code_string = get_code_string(base)
-    result = ""
-    result = str.encode(result)
+    result = ''
+    # result = str.encode(result)
     count = 0
     while val > 0:
         count += 1
+        print(f'code_string[int(val) % base:int(val) % base + 1] -{code_string[int(val) % base:int(val) % base + 1]}')
+        print(f'result-{result}')
         result = code_string[int(val) % base:int(val) % base + 1] + result
         val = int(val / base)
     if len(result) < minlen:
@@ -53,13 +55,12 @@ def encode(val, base, minlen=0):
 
 def decode(string, base):
     code_string = get_code_string(base)
-    string.decode()
     result = 0
     if base == 16:
         string = string.lower()
     while string:
         result *= base
-        result += code_string.find(string.decode()[0])
+        result += code_string.find(string[0])
         string = string[1:]
     return result
 
diff --git a/src/shared.py b/src/shared.py
index 60c35096..8cd86e6c 100644
--- a/src/shared.py
+++ b/src/shared.py
@@ -125,7 +125,7 @@ def reloadMyAddressHashes():
     keyfileSecure = checkSensitiveFilePermissions(state.appdata + 'keys.dat')
     hasEnabledKeys = False
     for addressInKeysFile in BMConfigParser().addresses():
-        isEnabled = BMConfigParser().getboolean(addressInKeysFile, 'enabled')
+        isEnabled = BMConfigParser().safeGet(addressInKeysFile, 'enabled')
         if isEnabled:
             hasEnabledKeys = True
             # status