Update 9.md

VortexRiderV2 · Oct 3, 2021 · 2516dc4 · 2516dc4
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diff --git a/md/9.md b/md/9.md
@@ -17,6 +17,13 @@ In [1]: float('3')
 Out[1]: 3.0
 ```
 
+```python
+import sys
+
+In[4]: sys.float_info.max                                                      
+Out[4]: 1.7976931348623157e+308
+```
+
 正无穷大、负无穷大
 ```python
 float('inf') # 正无穷大