>>> def f(x): return x + 2
... 
>>> f(5)
7
>>> f = 14
>>> # function names are variable names
>>> 
>>> 5
5
>>> (lambda x: 3*x + 1)(5)
16
>>> (lambda : print("cows"))()
cows
>>> quack = lambda x, y: x + y
>>> quack(4,5)
9
python table_of_values.py 
<tr><td>5</td><td>125</td></tr>
MAC:Thu Mar 03:10:39:0303> !vi
MAC:Thu Mar 03:10:45:0303> !p
python table_of_values.py 
<table>
<tr><th>x</th><th>f(x)</th></tr>
<tr><td>4</td><td>64</td></tr>
<tr><td>6</td><td>216</td></tr>
<tr><td>7</td><td>343</td></tr>
<tr><td>2</td><td>8</td></tr>
<tr><td>88</td><td>681472</td></tr>
<tr><td>1</td><td>1</td></tr>
<tr><td>-4</td><td>-64</td></tr>
</table>

>>> x = ["cat", "dog", "elephant"]
>>> for k, item in enumerate(x):
...     print(f"x[{k}] = {x[k]}")
... 
x[0] = cat
x[1] = dog
x[2] = elephant
>>> for k, item in enumerate(x, 50):
...     print(k, item)
... 
50 cat
51 dog
52 elephant
>>> for k in enumerate("caterwaul", 10):
...     print(k[0], k[1])
... 
10 c
11 a
12 t
13 e
14 r
15 w
16 a
17 u
18 l
>>> for k, item in enumerate("caterwaul", 10):
...     print(k, item)
... 
10 c
11 a
12 t
13 e
14 r
15 w
16 a
17 u
18 l
>>> 
>>>