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1.py

+                      #创建列表car, 列表中每个元素就是一个字典
+a='99AA--'
+print(len(a))
+sz=0
+zm=0
+qt=0
+for i in a:
+    if i>='a' and i<='z' or i>='A' and i<='Z':
+        zm+=1
+    if i>='0' and i<='9':
+        sz+=1
+    else:
+        qt+=1
+print(zm,sz,qt)
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