auto save

q.py

+#数列之积n*(n-1)*(n-2)*.......*1
+def faction(n):
+    if n==1:
+        return 1
+    else:
+        return n*faction(n-1)
+        
+data=input("你想算的积首项为多少")
+result=faction(int(data))
+print(result)
+
+   
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