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diy1.py

 #定义一个函数sum_numbers()
 #要求这个函数能接收一个名为num的整型参数
 #要求这个函数能计算1+2+3+……+num的结果
+def sum_numbers(sum):
+    if num == 1:
+        return 1
+    return num+sum_numbers(num-1)
+print(sum_numbers(3))        
 
 

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)
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