diff --git a/tri.py b/tri.py
new file mode 100644
index 0000000..9ab57ef
--- /dev/null
+++ b/tri.py
@@ -0,0 +1,15 @@
+def triangles(x, y):
+    if y == 1 or y == x: # y=1或y=x时，函数返回值为1
+        return 1
+    else:
+        z = triangles(x-1, y-1) + triangles(x-1, y) # y为其他值时的递推公式
+        return z
+if __name__ == "__main__":
+    n = int(input("请输入杨辉三角的行数："))
+    for i in range(1, n+1): # 输出n行
+        for j in range(0, n-i+1):
+            print("   ", end=" ")
+        for j in range(1, i+1):
+            # 调用递归函数，输出第i行的第j个值
+            print("%6d  " %(triangles(i, j)), end=" ")
+        print()
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