initial commit

Prog_2A/assignment_3/permute.py

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+import time
+
+
+def permute(picked: str, remaining: str):
+    if remaining == "" :
+        print(picked + remaining + ", ", end="")
+
+    else:
+        for i in range(len(remaining)):
+            pick = remaining[i]
+            front = remaining[:i]
+            back = remaining[i+1:]
+            permute(picked + pick, front + back)
+
+def main():
+    start = time.time()
+    permute("","abcdefghijk")
+    end = time.time()
+    print(end - start)
+    #"abcdefghijk" takes 85 sec
+
+main()

Prog_2A/assignment_3/tree.py

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+import math
+import random
+from turtle import Turtle
+
+
+def draw_turtle_line(turtle, start: (float,float), end: (float, float)):
+    turtle.penup()
+    turtle.goto(start[0], start[1])
+    turtle.pendown()
+    turtle.goto(end[0], end[1])
+
+def draw_branch(turtle, point: (float, float), angle: float, length: float):
+    if length > 10:
+        x1 = round(point[0] - math.sin(angle) * length)
+        y1 = round(point[1] + math.cos(angle) * length)
+        draw_turtle_line(turtle, point, (x1, y1))
+
+        bend_angle = math.radians(random.uniform(-10, 10))
+        branch_angle = math.radians(random.uniform(-40, 40))
+        draw_branch(turtle,(x1, y1), bend_angle - branch_angle, length *
+                    random.uniform(0.6, 0.8))
+        draw_branch(turtle,(x1, y1), bend_angle + branch_angle, length *
+                    random.uniform(0.6, 0.8))
+
+sophia = Turtle()
+draw_branch(sophia, (0, 0), 0.0 ,100)
+
+sophia.screen.mainloop()
+