save project

diy1.py

 def sum_numbers(num):
 def sum_numbers(num):
+    if num == 1:
+        return 1  
+
+    result = num + sum_numbers(num-1)     
+    return result
+number = 50
+res = sum_numbers(number)
+print("1到"+str(number)+"和是："+str(res))
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