Draft: Merge version0.1 changes into dev

Working plotID package version 0.1.0 with basic functionality. It is ready for testing according. This can be done with the instructions from the README.

plotoptions.py

@@ -9,7 +9,12 @@ class PlotOptions:
 
     Methods
     -------
-    __init__figs : figure object
+    __init__
+    validate_input: Check if input is correct type.
+
+    Attributes
+    ----------
+    figs : figure object
         Figure that will be tagged.
     prefix : str
         Prefix that is placed before the ID.
@@ -28,3 +33,37 @@ class PlotOptions:
         self.id_method = id_method
         self.rotation = rotation
         self.position = position
+
+    def validate_input(self):
+        """
+        Validate if input for PlotOptions is correct type.
+
+        Raises
+        ------
+        TypeError
+            TypeError is thrown if one of the attributes is not the correct
+            type.
+
+        Returns
+        -------
+        0, if all checks succeeded.
+
+        """
+        # %% Validate inputs
+        if isinstance(self.prefix, str):
+            pass
+        else:
+            raise TypeError("Prefix is not a string.")
+
+        if isinstance(self.figs, list):
+            pass
+        else:
+            raise TypeError("Figures are not a list.")
+
+        # TODO: Change id_method key from integer to (more meaningful) string.
+        try:
+            self.id_method = int(self.id_method)
+        except ValueError:
+            raise TypeError('The chosen ID id_method is not an integer.')
+
+        return 0