auto save

22.py

+def sum(n):
+    if n == 1:
+        return 1
+    n2 = sum(n - 1)
+    return  n + n2
+result = sum(3)
+print(result)
+
+

diy.py

+import turtle
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# pen.speed(1)
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
+
+pen.forward(100)
+pen.right(30)
+pen.forward(50)
+pen.up()
+pen.backward(50)
+pen.down()
+pen.left(60)
+pen.forward(50)
+pen.up()
+pen.backward(50)
+pen.down()
+pen.right(30)
+pen.up()
+pen.backward(100)
+pen.down()
+turtle.done()
\ No newline at end of file

diy1.py

+import turtle
+import random
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# pen.speed(1)
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
+
+# 分形树
+def a(n):
+    if n >= 30:
+        pen.forward(n)
+        x = random.randint(0,45)
+        pen.right(x)
+        a(n-10)
+        pen.left(2*x)
+        a(n-10)
+        pen.right(x)
+        pen.up()
+        pen.backward(n)
+        pen.down()        
+a(70)
+turtle.done()

diy2.py

+import turtle
+import random
+
+def tree(n):  # 画树枝
+    if n>=0:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+tree(60)
+turtle.done()

diy3.py

+import turtle
+import random
+
+pen = turtle.Turtle()
+pen.color('sienna')
+pen.speed(0)
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+# # 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
+
+# 树枝
+def tree(n):
+    if n >= 0:
+        if n <= 12:
+            color_list = ['snow', 'lightcoral']
+            color = random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n / 3)
+        else:
+            pen.color('sienna')  # 赭(zhě)色
+            pen.pensize(n / 10)  
+        pen.forward(n)
+        angle = random.random()
+        pen.right(30*angle)
+        length = 1.5*random.random()
+        tree(n-10*length)
+        pen.left(60*angle)
+        tree(n-10*length)
+        pen.right(30*angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+tree(60)
+turtle.done()

lesson14-diy1.py

+def sum_numbers(num):
+      # 递归的出口
+      if num == 1:
+           return 1
+
+      #  数字的累加
+      temp = sum_numbers(num - 1)
+      return num +temp
+result = sum_numbers(100)
+print(result)
\ No newline at end of file

lesson14-diy2.py

+def func(n):
+    if n<=2:
+        return 1
+    elif n>2:
+        value = func(n-1)+func(n-2)
+        return value
+
+result = func(8)
+print(result)
\ No newline at end of file