Python Installation
apt-get install python3
Sympy Installation
pip install sympy
Importing SymPy
from sympy import symbols, Symbol, init_printing
Sympy Symbols vs Variables
A SymPy variable acts the same way as variable in anyother programming language with the exception that by default it points to itself.
Normally if variable is called before it is defined NameError is raised.
Python 3.6.5 |Anaconda, Inc.| (default, Mar 29 2018, 13:32:41) [MSC v.1900 64 bit (AMD64)] on win32
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>>> x
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'x' is not defined
>>>
This declares x as a <sympy.Symbol> object
x = Symbol('x')