feature: implemented some numeric and sequence methods for 'SSHKey' class and added a function

sshkey_man.py

@@ -25,10 +25,12 @@ class SSHKeyType(Enum):
 
 # @TODO create unit tests for below class
 class SSHKey:
-    def __init__(self, *path: ExecutedPath):
+    def __init__(self, *path: ExecutedPath | str):
         if len(path) > 2 or len(path) < 1:
             raise ValueError
 
+        path = tuple(map(lambda s: Path(s) if isinstance(s, str) else s, path))
+
         self.__idx: int = 0
         self.__prev: Self | None = None
         self.__next: Self | None = None
@@ -93,17 +95,11 @@ class SSHKey:
     def __neqcontent__(self, other: Self) -> bool:
         return self.__value.read_text() != other._SSHKey__value.read_text()
 
-    def __add__(self, other: Self | ExecutedPath | str):
+    def __len__(self):
-        raise NotImplementedError
+        if isinstance(self.__value, tuple):
-
+            return len(self.__value)
-    def __radd__(self, other: Self | ExecutedPath | str):
+        else:
-        raise NotImplementedError
+            return 1
-
-    def __sub__(self, other: Self | ExecutedPath | str):
-        raise NotImplementedError
-
-    def __rsub__(self, other: Self | ExecutedPath | str):
-        raise NotImplementedError
 
     def update(self, *path: ExecutedPath | str) -> Self | Never:
         if len(path) > 2 or len(path) < 1:
@@ -118,6 +114,45 @@ class SSHKey:
 
         return self
 
+    def __add__(self, other: Self | ExecutedPath | str):
+        if isinstance(self.__value, tuple):
+            raise ValueError
+
+        if isinstance(other, Self):
+            if isinstance(other.__SSHKey__value, tuple):
+                raise ValueError
+
+            result = self.update(self.__value, other._SSHKey__value)
+        elif isinstance(other, (str, ExecutedPath)):
+            result = self.update(self.__value, other)
+        else:
+            raise TypeError
+
+        return result
+
+    def __radd__(self, other: Self | ExecutedPath | str):
+        if isinstance(self.__value, tuple):
+            raise ValueError
+
+        if isinstance(other, Self):
+            if isinstance(other.__SSHKey__value, tuple):
+                raise ValueError
+
+            result = self.update(other._SSHKey__value, self.__value)
+        elif isinstance(other, (str, ExecutedPath)):
+            result = self.update(other, self.__value)
+        else:
+            raise TypeError
+
+        return result
+
+    # @TODO write following 2 subtraction algorithms using 'set' data type conversion and methods
+    def __sub__(self, other: Self | ExecutedPath | str):
+        raise NotImplementedError
+
+    def __rsub__(self, other: Self | ExecutedPath | str):
+        raise NotImplementedError
+
     def replace(self, old: ExecutedPath | str | tuple[ExecutedPath | str] | list[ExecutedPath | str], new: ExecutedPath  | str | tuple[ExecutedPath | str] | list[ExecutedPath | str]) -> Self | Never:
         if isinstance(old, str):
             old = Path(old)
@@ -183,10 +218,18 @@ class SSHKey:
         return result
 
     @property
-    def status(self) -> Never:
+    def status(self) -> str | Never:
-        # @TODO this method should return string or Enum value after analyzing whether this key is public or private
+        # @TODO analyze 'read' return value of this class's instance to check whether it is a private key, 
+        # unless '__value' of this class's instance is a tuple, in which case it is a dual key
         raise NotImplementedError
 
+    def reverse(self) -> Never:
+        if isinstance(self.__value, tuple):
+            v1, v2 = *self.__value
+            result = self.update(v2, v1)
+        else:
+            result = self
+        return result
 
 def prev(arg):
     if isinstance(arg, SSHKey):
@@ -200,6 +243,12 @@ def stream_equal(s1, s2) -> bool | Never:
     else:
         raise TypeError
 
+def stream_unequal(s1, s2) -> bool | Never:
+    if isinstance(s1, SSHKey) and isinstance(s2, SSHKey):
+        return s1._SSHKey__neqcontent__(s2)
+    else:
+        raise TypeError
+
 
 # @TODO create unit tests for below class
 class SSHKeyCollection(Sequence):
@@ -385,20 +434,19 @@ class SSHKeyCollection(Sequence):
 
         return self.__last
 
-    # @TODO make sure to implement below method
     def __contains__(self) -> bool | Never:
         raise NotImplementedError
 
     def __missing__(self) -> Never:
         raise NotImplementedError
 
-    # @TODO make sure to implement below method
     def __iter__(self) -> Self | Never:
         raise NotImplementedError
 
     def count(self, query: RegEx | str) -> int | Never:
         raise NotImplementedError
 
+    # @TODO make sure to implement below method
     def pull(self, query: RegEx | str = "*") -> Never:
         raise NotImplementedError
 
@@ -409,7 +457,7 @@ class SSHKeyCollection(Sequence):
         raise NotImplementedError
 
 
-
+# @TODO maybe move to separate module for classes for handling users and groups
 class UserSSH:
     def __init__(self, username: str = "root", paths: Apps | None = None, keys: dict = dict(), password: str = "password123", fate: RootFate = RootFate.disposal.name):
         self.username = username