Python: add multi address (#1658)

* add weighted address and multi address

* fmt

bindings/python/iota_sdk/types/address.py

@@ -16,6 +16,7 @@ class AddressType(IntEnum):
         NFT (16): Nft address.
         ANCHOR (24): Anchor address.
         IMPLICIT_ACCOUNT_CREATION (32): Implicit Account Creation address.
+        MULTI (40): Multi address.
         RESTRICTED (48): Address with restricted capabilities.
 
     """
@@ -24,6 +25,7 @@ class AddressType(IntEnum):
     NFT = 16
     ANCHOR = 24
     IMPLICIT_ACCOUNT_CREATION = 32
+    MULTI = 40
     RESTRICTED = 48
 
 
@@ -109,6 +111,34 @@ def from_dict(addr_dict: dict):
             Ed25519Address(addr_dict['pubKeyHash']))
 
 
+@json
+@dataclass
+class WeightedAddress:
+    """An address with an assigned weight.
+    Attributes:
+        address: The unlocked address.
+        weight: The weight of the unlocked address.
+    """
+    address: Union[Ed25519Address, AccountAddress, NFTAddress, AnchorAddress]
+    weight: int
+
+
+@json
+@dataclass
+class MultiAddress:
+    """An address that consists of addresses with weights and a threshold value.
+    The Multi Address can be unlocked if the cumulative weight of all unlocked addresses is equal to or exceeds the
+    threshold.
+    Attributes:
+        addresses: The weighted unlocked addresses.
+        threshold: The threshold that needs to be reached by the unlocked addresses in order to unlock the multi address.
+    """
+    addresses: List[WeightedAddress]
+    threshold: int
+    type: int = field(default_factory=lambda: int(
+        AddressType.MULTI), init=False)
+
+
 @json
 @dataclass
 class RestrictedAddress:
@@ -149,6 +179,7 @@ class AddressWithUnspentOutputs():
                            NFTAddress,
                            AnchorAddress,
                            ImplicitAccountCreationAddress,
+                           MultiAddress,
                            RestrictedAddress]
 
 
@@ -170,6 +201,8 @@ def deserialize_address(d: Dict[str, Any]) -> Address:
         return AnchorAddress.from_dict(d)
     if address_type == AddressType.IMPLICIT_ACCOUNT_CREATION:
         return ImplicitAccountCreationAddress.from_dict(d)
+    if address_type == AddressType.MULTI:
+        return MultiAddress.from_dict(d)
     if address_type == AddressType.RESTRICTED:
         return RestrictedAddress.from_dict(d)
     raise Exception(f'invalid address type: {address_type}')