Update app.py

app.py

@@ -23,10 +23,11 @@ def wallet():
     
     lower_case_address = connect("wallet")
     st.write(lower_case_address[0][0:2])
+    address = ''
     if len(lower_case_address[0]) > 3:
         address = Web3.toChecksumAddress(lower_case_address[0])
     st.write(address)
-    if string(address[0][0:2]) == "0x":
+    if str(address[0][0:2]) == "0x":
 
         OCEAN_token = BToken(ocean.web3, ocean.OCEAN_address)