>>> x = 0
>>> y = 1
>>> x, y = y, x
>>> x
1
>>> y
0
>>> x = ["a", "bb", "ccc"]
>>> x
['a', 'bb', 'ccc']
>>> a, b, c = x
>>> a
'a'
>>> b
'bb'
>>> c
'ccc'
>>> a, b = x
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: too many values to unpack (expected 2)
>>> help(len)

>>> help(ord)

>>> print(ord.__doc__)
Return the Unicode code point for a one-character string.
>>> print(chr.__doc__)
Return a Unicode string of one character with ordinal i; 0 <= i <= 0x10ffff.
>>> 0x10ffff
1114111
>>> import math
>>> dir()
['__annotations__', '__builtins__', '__doc__', '__loader__', '__name__', '__package__', '__spec__', 'a', 'b', 'c', 'math', 'x', 'y']
>>> dir(math)
['__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', 'acos', 'acosh', 'asin', 'asinh', 'atan', 'atan2', 'atanh', 'ceil', 'comb', 'copysign', 'cos', 'cosh', 'degrees', 'dist', 'e', 'erf', 'erfc', 'exp', 'expm1', 'fabs', 'factorial', 'floor', 'fmod', 'frexp', 'fsum', 'gamma', 'gcd', 'hypot', 'inf', 'isclose', 'isfinite', 'isinf', 'isnan', 'isqrt', 'lcm', 'ldexp', 'lgamma', 'log', 'log10', 'log1p', 'log2', 'modf', 'nan', 'nextafter', 'perm', 'pi', 'pow', 'prod', 'radians', 'remainder', 'sin', 'sinh', 'sqrt', 'tan', 'tanh', 'tau', 'trunc', 'ulp']
>>> math.cos(0)
1.0
>>> math.cos(90)
-0.4480736161291702
>>> math.radians(1)
0.017453292519943295
>>> math.degrees(1)
57.29577951308232
>>> math.cos(Math.pi)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'Math' is not defined. Did you mean: 'math'?
>>> math.cos(math.pi)
-1.0
>>> math.log(10)
2.302585092994046
>>> math.log(100)/math.log(10)
2.0
>>> math.log(100, 10)
2.0
>>> math.log(1000, 2)
9.965784284662087
>>> math.pow(2,10)
1024.0
>>> math.factorial(30)
265252859812191058636308480000000
>>> math.factorial(1000)
402387260 (zillions of digits ...) 0000000000000000000
>>> help(math.factorial)

>>> dir(math)
['__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__',
'acos', 'acosh', 'asin', 'asinh', 'atan', 'atan2', 'atanh', 'ceil', 'comb',
'copysign', 'cos', 'cosh', 'degrees', 'dist', 'e', 'erf', 'erfc', 'exp',
'expm1', 'fabs', 'factorial', 'floor', 'fmod', 'frexp', 'fsum', 'gamma', 'gcd',
'hypot', 'inf', 'isclose', 'isfinite', 'isinf', 'isnan', 'isqrt', 'lcm',
'ldexp', 'lgamma', 'log', 'log10', 'log1p', 'log2', 'modf', 'nan', 'nextafter',
'perm', 'pi', 'pow', 'prod', 'radians', 'remainder', 'sin', 'sinh', 'sqrt',
'tan', 'tanh', 'tau', 'trunc', 'ulp']
>>> print(exp.__doc__)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'exp' is not defined
>>> print(math.exp.__doc__)
Return e raised to the power of x.
>>> math.sqrt(2)
1.4142135623730951
>>> math.lcm(3,22)
66
>>> math.lcm(3,255)
255
>>> math.gcd(9238059238452389509823408902340892345, 382990832983024982349324089802349824398234293485)
15
>>> math.floor(4.5)
4
>>> math.floor(-4.5)
-5
>>> math.ceil(2.000000001)
3
>>> math.round(4.5)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'math' has no attribute 'round'
>>> dir(math)
['__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', 'acos', 'acosh', 'asin', 'asinh', 'atan', 'atan2', 'atanh', 'ceil', 'comb', 'copysign', 'cos', 'cosh', 'degrees', 'dist', 'e', 'erf', 'erfc', 'exp', 'expm1', 'fabs', 'factorial', 'floor', 'fmod', 'frexp', 'fsum', 'gamma', 'gcd', 'hypot', 'inf', 'isclose', 'isfinite', 'isinf', 'isnan', 'isqrt', 'lcm', 'ldexp', 'lgamma', 'log', 'log10', 'log1p', 'log2', 'modf', 'nan', 'nextafter', 'perm', 'pi', 'pow', 'prod', 'radians', 'remainder', 'sin', 'sinh', 'sqrt', 'tan', 'tanh', 'tau', 'trunc', 'ulp']
>>> ^D
MAC:Thu Feb 17:10:55:~> !p
python
Python 3.10.0 (v3.10.0:b494f5935c, Oct  4 2021, 14:59:19) [Clang 12.0.5 (clang-1205.0.22.11)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> dir()
['__annotations__', '__builtins__', '__doc__', '__loader__', '__name__', '__package__', '__spec__']
>>> from math import *
>>> dir()
['__annotations__', '__builtins__', '__doc__', '__loader__', '__name__',
'__package__', '__spec__', 'acos', 'acosh', 'asin', 'asinh', 'atan', 'atan2',
'atanh', 'ceil', 'comb', 'copysign', 'cos', 'cosh', 'degrees', 'dist', 'e',
'erf', 'erfc', 'exp', 'expm1', 'fabs', 'factorial', 'floor', 'fmod', 'frexp',
'fsum', 'gamma', 'gcd', 'hypot', 'inf', 'isclose', 'isfinite', 'isinf',
'isnan', 'isqrt', 'lcm', 'ldexp', 'lgamma', 'log', 'log10', 'log1p', 'log2',
'modf', 'nan', 'nextafter', 'perm', 'pi', 'pow', 'prod', 'radians',
'remainder', 'sin', 'sinh', 'sqrt', 'tan', 'tanh', 'tau', 'trunc', 'ulp']
>>> ##intimate import, you are on a first-name basis
>>> cos(0)
1.0
>>> pi = 4
>>> cos(pi)
-0.6536436208636119
>>> ^D
MAC:Thu Feb 17:10:57:~> python
Python 3.10.0 (v3.10.0:b494f5935c, Oct  4 2021, 14:59:19) [Clang 12.0.5 (clang-1205.0.22.11)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from math import cos
>>> cos(0)
1.0
>>> dir()
['__annotations__', '__builtins__', '__doc__', '__loader__', '__name__', '__package__', '__spec__', 'cos']
>>> from math import log, sin
>>> dir()
['__annotations__', '__builtins__', '__doc__', '__loader__', '__name__', '__package__', '__spec__', 'cos', 'log', 'sin']
>>> ##selective import
>>> 
>>>