>>> ord("a")
97
>>> ord("b")
98
>>> ord("abc")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: ord() expected a character, but string of length 3 found
>>> chr(56)
'8'
>>> chr(144)
'\x90'
>>> chr(32)
' '
>>> 
(base) MAC:Mon Feb 15:09:51:ch3> vi fun.py
(base) MAC:Mon Feb 15:09:53:ch3> python fun.py
(base) MAC:Mon Feb 15:09:53:ch3> !vi
vi fun.py
(base) MAC:Mon Feb 15:09:54:ch3> python fun.py
100
(base) MAC:Mon Feb 15:09:54:ch3> !vi
vi fun.py
(base) MAC:Mon Feb 15:09:56:ch3> !p
python fun.py
100
121
(base) MAC:Mon Feb 15:09:56:ch3> !vi
vi fun.py
(base) MAC:Mon Feb 15:09:58:ch3> python fun.py
100
121
Sell back your houses at half-price to the bank
Mortage your deeds!
Pay me!
(base) MAC:Mon Feb 15:09:58:ch3> !vi
vi fun.py
(base) MAC:Mon Feb 15:09:59:ch3> !p
python fun.py
100
121
Sell back your houses at half-price to the bank
Mortage your deeds!
Pay me!
None
(base) MAC:Mon Feb 15:09:59:ch3> python
Python 3.8.5 (default, Sep  4 2020, 02:22:02) 
[Clang 10.0.0 ] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> type(None)
<class 'NoneType'>
>>> 
(base) MAC:Mon Feb 15:10:00:ch3> !vi
vi fun.py
(base) MAC:Mon Feb 15:10:08:ch3> python
Python 3.8.5 (default, Sep  4 2020, 02:22:02) 
[Clang 10.0.0 ] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> dir()
['__annotations__', '__builtins__', '__doc__', '__loader__', '__name__', '__package__', '__spec__']
>>> dir(__builtins__)
['ArithmeticError', 'AssertionError', 'AttributeError', 'BaseException',
'BlockingIOError', 'BrokenPipeError', 'BufferError', 'BytesWarning',
'ChildProcessError', 'ConnectionAbortedError', 'ConnectionError',
'ConnectionRefusedError', 'ConnectionResetError', 'DeprecationWarning',
'EOFError', 'Ellipsis', 'EnvironmentError', 'Exception', 'False',
'FileExistsError', 'FileNotFoundError', 'FloatingPointError', 'FutureWarning',
'GeneratorExit', 'IOError', 'ImportError', 'ImportWarning', 'IndentationError',
'IndexError', 'InterruptedError', 'IsADirectoryError', 'KeyError',
'KeyboardInterrupt', 'LookupError', 'MemoryError', 'ModuleNotFoundError',
'NameError', 'None', 'NotADirectoryError', 'NotImplemented',
'NotImplementedError', 'OSError', 'OverflowError', 'PendingDeprecationWarning',
'PermissionError', 'ProcessLookupError', 'RecursionError', 'ReferenceError',
'ResourceWarning', 'RuntimeError', 'RuntimeWarning', 'StopAsyncIteration',
'StopIteration', 'SyntaxError', 'SyntaxWarning', 'SystemError', 'SystemExit',
'TabError', 'TimeoutError', 'True', 'TypeError', 'UnboundLocalError',
'UnicodeDecodeError', 'UnicodeEncodeError', 'UnicodeError',
'UnicodeTranslateError', 'UnicodeWarning', 'UserWarning', 'ValueError',
'Warning', 'ZeroDivisionError', '_', '__build_class__', '__debug__', '__doc__',
'__import__', '__loader__', '__name__', '__package__', '__spec__', 'abs',
'all', 'any', 'ascii', 'bin', 'bool', 'breakpoint', 'bytearray', 'bytes',
'callable', 'chr', 'classmethod', 'compile', 'complex', 'copyright', 'credits',
'delattr', 'dict', 'dir', 'divmod', 'enumerate', 'eval', 'exec', 'exit',
'filter', 'float', 'format', 'frozenset', 'getattr', 'globals', 'hasattr',
'hash', 'help', 'hex', 'id', 'input', 'int', 'isinstance', 'issubclass',
'iter', 'len', 'license', 'list', 'locals', 'map', 'max', 'memoryview', 'min',
'next', 'object', 'oct', 'open', 'ord', 'pow', 'print', 'property', 'quit',
'range', 'repr', 'reversed', 'round', 'set', 'setattr', 'slice', 'sorted',
'staticmethod', 'str', 'sum', 'super', 'tuple', 'type', 'vars', 'zip']
>>> 
(base) MAC:Mon Feb 15:10:09:ch3> !vi
vi fun.py
(base) MAC:Mon Feb 15:10:09:ch3> vi fun.py
(base) MAC:Mon Feb 15:10:10:ch3> vi yokel.py
(base) MAC:Mon Feb 15:10:10:ch3> python yokel.py 
100
(base) MAC:Mon Feb 15:10:10:ch3> !vi
vi yokel.py
(base) MAC:Mon Feb 15:10:11:ch3> python yokel.py 
100
Traceback (most recent call last):
  File "yokel.py", line 6, in <module>
    print(y)
NameError: name 'y' is not defined
(base) MAC:Mon Feb 15:10:11:ch3> !vi
vi yokel.py
(base) MAC:Mon Feb 15:10:22:ch3>