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Task/Biorhythms/Python/biorhythms.py

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+"""
+
+Python implementation of
+
+http://rosettacode.org/wiki/Biorhythms
+
+"""
+
+from datetime import date, timedelta
+from math import floor, sin, pi
+
+def biorhythms(birthdate,targetdate):
+    """
+    Print out biorhythm data for targetdate assuming you were
+    born on birthdate.
+
+    birthdate and targetdata are strings in this format:
+
+    YYYY-MM-DD e.g. 1964-12-26
+    """
+
+    # print dates
+
+    print("Born: "+birthdate+" Target: "+targetdate)
+
+    # convert to date types - Python 3.7 or later
+
+    birthdate = date.fromisoformat(birthdate)
+    targetdate = date.fromisoformat(targetdate)
+
+    # days between
+
+    days = (targetdate - birthdate).days
+
+    print("Day: "+str(days))
+
+    # cycle logic - mostly from Julia example
+
+    cycle_labels = ["Physical", "Emotional", "Mental"]
+    cycle_lengths = [23, 28, 33]
+    quadrants = [("up and rising", "peak"), ("up but falling", "transition"),
+                   ("down and falling", "valley"), ("down but rising", "transition")]
+
+    for i in range(3):
+        label = cycle_labels[i]
+        length = cycle_lengths[i]
+        position = days % length
+        quadrant = int(floor((4 * position) / length))
+        percentage = int(round(100 * sin(2 * pi * position / length),0))
+        transition_date = targetdate + timedelta(days=floor((quadrant + 1)/4 * length) - position)
+        trend, next = quadrants[quadrant]
+
+        if percentage > 95:
+            description = "peak"
+        elif percentage < -95:
+             description = "valley"
+        elif abs(percentage) < 5:
+             description = "critical transition"
+        else:
+             description = str(percentage)+"% ("+trend+", next "+next+" "+str(transition_date)+")"
+        print(label+" day "+str(position)+": "+description)
+
+
+biorhythms("1943-03-09","1972-07-11")