smathieson@smathieson-24 summary_stats % python3
Python 3.9.6 (default, Feb  3 2024, 15:58:27) 
[Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.


# user input and random


>>> phrase = input("phrase: ")
phrase: creative code
>>> phrase
'creative code'
>>> x = input('enter num classes: ")
  File "<stdin>", line 1
    x = input('enter num classes: ")
                                    ^
SyntaxError: EOL while scanning string literal
>>> x = input('enter num classes: ')
enter num classes: 4
>>> x
'4'
>>> x = int(input('enter num classes: '))
enter num classes: 4
>>> x
4
>>> # random module
>>> import random
>>> 
>>> total = 0
>>> for i in range(10):
...     total += random.randrange(1,7)
... 
>>> total
41
>>> for i in range(10):
...     total += random.randrange(1,7)
... 
>>> total
83
>>> [random.randrange(1,7) for i in range(10)]
[2, 5, 3, 1, 2, 3, 4, 4, 5, 5]
>>> [random.randrange(1,7) for i in range(10)]
[4, 6, 5, 2, 2, 3, 3, 1, 6, 4]
>>> 


# plotting


>>> 
>>> import matplotlib.pyplot as plt
>>> rolls = [random.randrange(1,7) for i in range(10)]
>>> rolls
[4, 1, 4, 5, 1, 4, 3, 4, 3, 1]
>>> 
>>> plt.plot(range(10), rolls) # x list, y list
[<matplotlib.lines.Line2D object at 0x107c8a7c0>]
>>> plt.show()
>>> plt.scatter(range(10), rolls) # x list, y list
<matplotlib.collections.PathCollection object at 0x129ae2fa0>
>>> plt.show()
>>> plt.clf()
>>> plt.savefig("my_plot.png")
>>> plt.bar(range(10), rolls) # x list, y list
<BarContainer object of 10 artists>
>>> plt.show()
>>> rolls = [random.randrange(1,7) for i in range(100000)]
>>> rolls
[1, 3, 3, 2, 1, 1, 5, 1, 3, 1, 2, 1, 5, 6, 2, 5, 1, 5, 4, 4, 4, 3, 4, 5, ..., 1, 6, 3]
>>> plt.hist(rolls)
(array([16566.,     0., 16701.,     0., 16484.,     0., 16995.,     0.,
       16718., 16536.]), array([1. , 1.5, 2. , 2.5, 3. , 3.5, 4. , 4.5, 5. , 5.5, 6. ]), <BarContainer object of 10 artists>)
>>> plt.show()
>>> 


# numpy


>>> import numpy as np
>>> 
>>> arr = np.zeros((3,4)) # rows, columns
>>> arr
array([[0., 0., 0., 0.],
       [0., 0., 0., 0.],
       [0., 0., 0., 0.]])
>>> 
>>> arr[2][3] = 7
>>> arr
array([[0., 0., 0., 0.],
       [0., 0., 0., 0.],
       [0., 0., 0., 7.]])
>>> arr[2,3] = 6
>>> arr
array([[0., 0., 0., 0.],
       [0., 0., 0., 0.],
       [0., 0., 0., 6.]])
>>> arr[0,2] = 6
>>> arr[2,1] = 5
>>> arr
array([[0., 0., 6., 0.],
       [0., 0., 0., 0.],
       [0., 5., 0., 6.]])
>>> arr[1]
array([0., 0., 0., 0.])
>>> arr[:,1]
array([0., 0., 5.])
>>> arr[1,:2]
array([0., 0.])
>>> arr[2,:2]
array([0., 5.])
>>> 


# dictionaries


>>> animals = {} # empty dictionary
>>> type(animals)
<class 'dict'>
>>> animals["dog"] = 4
>>> animals["snake"] = 0
>>> animals
{'dog': 4, 'snake': 0}
>>> animals["cat"] = 4
>>> animals["octopus"] = 8
>>> animals["human"] = 2
>>> animals
{'dog': 4, 'snake': 0, 'cat': 4, 'octopus': 8, 'human': 2}
>>> for animal in animals:
...     print(animal)
... 
dog
snake
cat
octopus
human
>>> for animal in animals:
...     print(animal, animals[animal])
... 
dog 4
snake 0
cat 4
octopus 8
human 2
>>> for animal in animals:
...     if animals[animal] == 4:
...             print(animal)
... 
dog
cat
>>> for key, value in animals.items():
...     print(key, value)
... 
dog 4
snake 0
cat 4
octopus 8
human 2
>>>