misc

Author: jstac

lectures/names.md

@@ -568,96 +568,5 @@ If you want to modify the local `x` and the global `x` separately, you can creat
 
 We will leave this for you to explore.
 
-## Summary
 
-Messages in this lecture are clear:
-
-* In Python, *everything in memory is treated as an object*.
-* Zero, one or many names can be bound to a given object.
-* Every name resides within a scope defined by its namespace.
-
-This includes not just lists, strings, etc., but also less obvious things, such as
-
-* functions (once they have been read into memory)
-* modules  (ditto)
-* files opened for reading or writing
-* integers, etc.
-
-Consider, for example, functions.
-
-When Python reads a function definition, it creates a **function object** and stores it in memory.
-
-The following code illustrates further this idea
-
-```{code-cell} python3
-#reset the current namespace
-%reset
-```
-
-```{code-cell} python3
-def f(x): return x**2
-f
-```
-
-```{code-cell} python3
-type(f)
-```
-
-```{code-cell} python3
-id(f)
-```
-
-```{code-cell} python3
-f.__name__
-```
-
-We can see that `f` has type, identity, attributes and so on---just like any other object.
-
-It also has methods.
-
-One example is the `__call__` method, which just evaluates the function
-
-```{code-cell} python3
-f.__call__(3)
-```
-
-Another is the `__dir__` method, which returns a list of attributes.
-
-We can also find `f` our current namespace
-
-```{code-cell} python3
-'f' in dir()
-```
-
-Modules loaded into memory are also treated as objects
-
-```{code-cell} python3
-import math
-
-id(math)
-```
-
-We can find `math` in our global namespace after the import
-
-```{code-cell} python3
-print(dir()[-1::-1])
-```
-
-We can also find all objects associated with the `math` module in the private namespace of `math`
-
-```{code-cell} python3
-print(dir(math))
-```
-
-We can also directly import objects to our current namespace using `from ... import ...`
-
-```{code-cell} python3
-from math import log, pi, sqrt
-
-print(dir()[-1::-1])
-```
-
-We can find these names appear in the current namespace now.
-
-*This uniform treatment of data in Python (everything is an object) helps keep the language simple and consistent.*