Last login: Thu Aug 26 09:10:25 on ttys001

The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.
(base) MAC:Thu Aug 26:10:21:~> python
Python 3.8.11 (default, Aug  6 2021, 08:56:27) 
[Clang 10.0.0 ] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> x = []
>>> y = []
>>> x == y
True
>>> x is y
False
>>> id(x)
140504783066752
>>> id(y)
140504783240384
>>> x = "cows"
>>> y = "cows"
>>> x == y
True
>>> x is y
True
>>> x[0] = "C"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'str' object does not support item assignment
>>> x = 5
>>> y = 5
>>> x == y
True
>>> x is y
True
>>> id(x)
4317584000
>>> hex(id(x))
'0x101591a80'
>>> x not is y
  File "<stdin>", line 1
    x not is y
          ^
SyntaxError: invalid syntax
>>> x is not y
False
>>> x = []
>>> y = x
>>> y.append(5)
>>> y
[5]
>>> x
[5]
>>> x is y
True
>>> "aliasing"
'aliasing'
>>> #Mutablity is convenient, and dangerous.
>>> t = (1, 2, 3)
>>> t
(1, 2, 3)
>>> t[0]
1
>>> t[0] = 5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> type(t)
<class 'tuple'>
>>> x = [1,2,3]
>>> t
(1, 2, 3)
>>> x
[1, 2, 3]
>>> id(x)
140504783066752
>>> x = x + [4,5,6]
>>> id(x)
140504783305216
>>> x = [1,2,3]
>>> id(x)
140504783066752
>>> x.append(4)
>>> x
[1, 2, 3, 4]
>>> id(x)
140504783066752
>>> t.append(4)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'append'
>>> id(t)
140504782866048
>>> t = t + (4,5,6)
>>> t
(1, 2, 3, 4, 5, 6)
>>> id(t)
140504782490496
>>> animal = 
  File "<stdin>", line 1
    animal = 
            ^
SyntaxError: invalid syntax
>>> animal = "cow"
>>> id(animal)
140504783306672
>>> animal += "pie"
>>> animal
'cowpie'
>>> id(animal)
140504783314992
>>> len(animal)
6
>>> t
(1, 2, 3, 4, 5, 6)
>>> len(t)
6
>>> 7 in t
False
>>> x
[1, 2, 3, 4]
>>> 4 in x
True
>>> "cow" in "cowpie"
True
>>> z
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'z' is not defined
>>> "ce" in "cowpie"
False
>>> x
[1, 2, 3, 4]
>>> x[1:]
[2, 3, 4]
>>> x[1:4]
[2, 3, 4]
>>> x[4]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range
>>> x[-1]
4
>>> x[-2]
3
>>> t
(1, 2, 3, 4, 5, 6)
>>> t[1:]
(2, 3, 4, 5, 6)
>>> t[1:4]
(2, 3, 4)
>>> t[6]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: tuple index out of range
>>> s = "abcdefg"
>>> s[1:]
'bcdefg'
>>> s[1:4]
'bcd'
>>> #### Lists are diffeent
>>> ## Who is Rosemary Woods?
>>> foo = ["I", "am", "not", "a", "crook"]
>>> foo[1,3]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers or slices, not tuple
>>> foo[1:3]
['am', 'not']
>>> foo[1:3] = []
>>> foo
['I', 'a', 'crook']
>>> foo
['I', 'a', 'crook']
>>> foo[1:1]
[]
>>> foo[1:1] = "cookiewoofage"
>>> foo
['I', 'c', 'o', 'o', 'k', 'i', 'e', 'w', 'o', 'o', 'f', 'a', 'g', 'e', 'a', 'crook']
>>> foo[:15] = []
>>> foo
['crook']
>>> #NC-17  sequences have iterators inside of them
>>> #Iterators determine how a sequence is walked through.
>>> list(t)
[1, 2, 3, 4, 5, 6]
>>> list("Iowa sow")
['I', 'o', 'w', 'a', ' ', 's', 'o', 'w']
>>> "*
  File "<stdin>", line 1
    "*
     ^
SyntaxError: EOL while scanning string literal
>>> "*
  File "<stdin>", line 1
    "*
     ^
SyntaxError: EOL while scanning string literal
>>> "*"*50
'**************************************************'
>>> "*"*1.5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't multiply sequence by non-int of type 'float'
>>> "*"*(-2)
''
>>> x = ["hello", 42]
>>> max(x)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: '>' not supported between instances of 'int' and 'str'
>>> x = [4,2,8,5,3]
>>> max(x)
8
>>> min(x)
2
>>> ##homogeneious sequence of orderable items.
>>> 
>>> x = [complex(0,0), complex(1,1)]
>>> x
[0j, (1+1j)]
>>> max(x)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: '>' not supported between instances of 'complex' and 'complex'
>>> 'mississippi'.count("i")
4
>>> x = [1,2,3,4,5]