提交示例代码

Author: lierchao1997

xuanyuanyulong/2020-08-24-python-with-statement/__init__.py

@@ -0,0 +1,3 @@
+JUST
+DO
+PYTHON

xuanyuanyulong/2020-08-24-python-with-statement/test.txt

@@ -0,0 +1,10 @@
+class testContextManager:
+    def __enter__(self):
+        print("进入运行时上下文，调用__enter__方法")
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        print("退出运行时上下文，调用__exit__方法")
+
+
+with testContextManager() as o:
+    pass

xuanyuanyulong/2020-08-24-python-with-statement/test_context_manager.py

@@ -0,0 +1,13 @@
+with open("test.txt", "r", encoding="utf-8") as f:
+    s = f.readlines()
+
+
+print(s)
+
+# try:
+#     f = open("test.txt", "a", encoding="utf-8")
+#     s = f.readlines()
+# except:
+#     print("出现异常")
+# finally:
+#     f.close()