auto save

demo.py

+def sum(n):
+    if n == 1:
+        return 1
+    a = n+sum(n-1)
+    return a
+print(sum(5))
\ No newline at end of file

diy.py

+def func(n):
+    if n <= 2:
+        return 1
+    else:
+        value = func(n-1)+func(n-2)
+        return value
+n=3
+while True:
+    if func(n) > 2000:
+        print('第',n,'列斐波那契数列的值大于2000')
+        break
+    n += 1
\ No newline at end of file