3.7.0 (v3.7.0:1bf9cc5093, Jun 26 2018, 23:26:24) 
[Clang 6.0 (clang-600.0.57)]
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2 + 3
5

# Variables
x = 7
x
7
y
Traceback (most recent call last):
  Python Shell, prompt 5, line 1
builtins.NameError: name 'y' is not defined
x = 5 + 12
x
17
y = x
y
17
x
17
y
17
x = 2
x
2
y
17

# We can find the memory address using id(x)
id(x)
4417252384
# python tries to reuse the same memory address for ints
x = 8
y = 8
id(x)
4417252576
id(y)
4417252576
# what about floats?
x = 8.2
y = 8.2
id(x)
4418665472
id(y)
4418663456

# worksheet
k = 5
j = 3k
Traceback (most recent call last):
  Python Shell, prompt 29, line 1
Syntax Error: invalid syntax: <string>, line 1, pos 6
j = k * 3
j
15
k * 3 = j
Traceback (most recent call last):
  Python Shell, prompt 32, line 1
Syntax Error: can't assign to operator: <string>, line 1, pos 0
x = 4
y = 5
x = 2
x
2
y
5
x = 4 
y = x + 2
x = y + 1
x
7
y
6