# Materials adapted from Sara Mathieson

PS C:\Users\tnguyen3> python3
Python 3.12.10 (tags/v3.12.10:0cc8128, Apr  8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> # USER INPUT
>>> x = input('enter num classes: ')
enter num classes: 4
>>> x
'4'
>>>
>>> x = int(input('enter num classes: '))
enter num classes: 10
>>> x
10
>>>
>>>
>>> # RANDOM MODULE
>>> import random
>>>
>>> random.random()
0.5169113229232403
>>> random.random()
0.2011943952664237
>>>
>>> total = 0
>>> for i in range(10):
...     total += random.randrange(1,7) # die roll
...
>>> total
30
>>>
>>> rolls = [random.randrange(1,7,2) for i in range(10)]
>>> rolls
[5, 1, 5, 1, 5, 3, 5, 1, 1, 5]
>>>
>>>
>>> # PLOTTING
>>> import matplotlib.pyplot as plt
>>>
>>> plt.plot(range(10), rolls) # x list, y list
[<matplotlib.lines.Line2D object at 0x00000158DA032D20>]
>>> plt.show()
>>>
>>> plt.scatter(range(10), rolls)
<matplotlib.collections.PathCollection object at 0x00000158DA08EA50>
>>> plt.show()
>>> plt.show() # nothing shows up, as the current figure has already been displayed and emptied
>>>
>>> plt.bar(range(10), rolls)
<BarContainer object of 10 artists>
>>> plt.show()
>>>
>>> rolls = [random.randrange(1,7) for i in range(10000)]
>>> plt.hist(rolls)
(array([1652.,    0., 1732.,    0., 1640.,    0., 1662.,    0., 1674.,
       1640.]), 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 = np.array([[1,2,3,4], [5,6,7,8]])
>>> arr
array([[1, 2, 3, 4],
       [5, 6, 7, 8]])
>>>
>>> arr.shape
(2, 4)
>>>
>>> arr[1,2] = 8
>>> arr
array([[1, 2, 3, 4],
       [5, 6, 8, 8]])
>>>
>>> arr[1]
array([5, 6, 8, 8])
>>>
>>> arr[0,:]
array([1, 2, 3, 4])
>>>
>>> arr[:,0]
array([1, 5])
>>>
>>> arr[:,:3]
array([[1, 2, 3],
       [5, 6, 8]])
>>>
>>> arr[0,1:2]
array([2])
>>>
>>>
>>> # DICTIONARIES
>>> dict = {} # empty dictionary
>>> len(dict)
0
>>> dict[1]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 1
>>> dict[0] = "Chang"
>>> dict[1] = "Owen"
>>> dict[2] = "Rustom"
>>> dict[3] = "Thao"
>>> dict
{0: 'Chang', 1: 'Owen', 2: 'Rustom', 3: 'Thao'}
>>> dict[1]
'Owen'
>>> for i in dict:
...     print(i)
...
0
1
2
3
>>> for k, v in dict.items():
...     print(v)
...
Chang
Owen
Rustom
Thao