init

main.py

@@ -0,0 +1,54 @@
+# minimal counting function used for review
+
+chromatic_scale = ['A', 'A#', 'B', 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#']
+note_value = {e:i for i, e in enumerate(chromatic_scale)}
+seven_chord_interval_name = {
+    'M7#5':(4,4,3),
+    'M7':(4,3,4),
+    '7':(4,3,3),
+    'mM7':(3,4,4),
+    'm7':(3,4,3),
+    'm7b5':(3,3,4),
+    'dim7':(3,3,3),
+}
+major_scale_intervals = [2,2,1,2,2,2,1]
+
+def get_major_scale(root):
+    scale = []
+    scale.append(root)
+    root_index = note_value[root]
+    for interval in major_scale_intervals:
+        root_index = (root_index + interval) % 12
+        scale.append(chromatic_scale[root_index])
+    return scale
+
+def get_number_of_half_steps(note1, note2):
+    return min(abs(note_value[note1] - note_value[note2]), 12 - abs(note_value[note1] - note_value[note2]))
+
+def _construct_chord(root, interval_type=(4,3,3)):
+    chord = []
+    chord.append(root)
+    root_index = note_value[root]
+    for interval in interval_type:
+        root_index = (root_index + interval) % 12
+        chord.append(chromatic_scale[root_index])
+    return chord
+
+words=""
+
+while words != "quit":
+    words = input("Enter a note or chord: ")
+    notes = words.split(" ")
+    if notes[0][1:] in seven_chord_interval_name.keys():
+        # construct dominant 7 chord
+        chord = _construct_chord(notes[0][0],seven_chord_interval_name[notes[0][1:]])
+        print(chord,get_major_scale(notes[0][0]))
+    else:
+        # calculate the interval between notes
+        res=[]
+        for i in range(len(notes)-1):
+            if notes[i] not in note_value or notes[i+1] not in note_value:
+                print("Invalid note")
+                break
+            res.append(get_number_of_half_steps(notes[i], notes[i+1]))
+        print(res)