添加例子文件，忽略 cs-fix cache

.gitignore

@@ -3,3 +3,4 @@
 /vendor
 /tmp
 /examples/wordpress
+/.php-cs-fixer.cache

cases/subscript.py

@@ -0,0 +1,15 @@
+import sys
+
+a = [6, 7, 8, 9, 10]
+
+a[1] = 3
+b = a[2]
+del a[3]
+
+print(a[1:4])
+del a[1:4]
+
+m = {'a': 1, 'b': 2, 'c': 3}
+print(m['b'])
+del m['b']
+c = m['c']