arjunprakash027 · October 7, 2023 17:07 · Oct 7, 2023 · Oct 7, 2023
diff --git a/context_managers_in_py.py b/context_managers_in_py.py
@@ -0,0 +1,118 @@
+#below is the class based context manager
+
+class ContextTest:
+
+    def __init__(self) -> None:
+        print("initialized the ContextManager")
+
+    def __enter__(self) -> None:
+        print("entered into the with block")
+
+    def __exit__(self,exc_type,exc_value,exc_traceback) -> None:
+        print(exc_type,exc_value,exc_traceback)
+        print("excited the with block")
+
+with ContextTest() as manager:
+    print("inside the with")
+
+
+#decorator based context manager
+from contextlib import contextmanager
+
+@contextmanager
+def write_something(name):
+    try:
+        print("entered the with block")
+        yield name
+    finally:
+        print("exited the with block")
+
+with write_something("hello") as name:
+    print("inside the with block:",name)
+
+
+#a bullet point manager (a fun implementation of with statement)
+
+class BulletList:
+
+    def __init__(self)->None:
+        self.intend = 0
+
+    def __enter__(self):
+        self.intend += 1
+        return self
+
+    def __exit__(self,exc_type,exc_value,exc_traceback) -> None:
+        self.intend -= 1
+
+    def bulletType(self) -> str:
+        types = ["o ","- ","* "]
+        return types[self.intend%3]
+
+    def item(self,text)-> None:
+        print(" "*self.intend + self.bulletType() + text)
+
+with BulletList() as bullet:
+    bullet.item("hello")
+    with bullet:
+        bullet.item("world")
+        bullet.item("python")
+    with bullet:
+        bullet.item("is awesome")
+        with bullet:
+            bullet.item("and so is you")
+            bullet.item("and so is me")
+
+        bullet.item("and so is we all")
+        with bullet:
+            bullet.item("and so is you and me")
+            bullet.item("and so is me and all")
+
+    bullet.item("and so is we all and us")
+
+class TesingWith:
+
+    def __init__(self) -> None:
+        self.num = 0
+
+    def __enter__(self):
+        self.num += 1
+        return self
+
+    def __exit__(self,exc_type,exc_value,exc_traceback) -> None:
+        self.num -= 1
+
+    def display(self) -> None:
+        print(self.num)
+
+
+with TesingWith() as t:
+    t.display()
+    with t:
+        t.display()
+        with t:
+            t.display()
+            with t:
+                t.display()
+                with t:
+                    t.display()
+                    with t:
+                        t.display()
+                        with t:
+                            t.display()
+                            with t:
+                                t.display()
+                                with t:
+                                    t.display()
+                                    with t:
+                                        t.display()
+                                    t.display()
+                                t.display()
+                            t.display()
+                        t.display()
+                    t.display()
+                t.display()
+            t.display()
+        t.display()
+    t.display()
+t.display()