sympy: Creating rich symbols

sympy_rich_symbols.py

# Creating rich symbols with sympy
# Run this code on Sympy Live: http://bit.ly/rich-symbols

from sympy import *
init_printing()

# sympy.abc defines all greek alphabets.
# Even otherwise, when we create a symbol like alpha, beta etc,
# we get a nice greek alphabet representation with init_printing
alpha = symbols('alpha')

# underscore for subscripts, ^ for superscripts
ai, yn = symbols('a_i, y^n')
# can be combined
beta_i_n = symbols('beta_i^n')
vttt = symbols("upsilon^'''")

# Latex can be used to form rich symbols
vttt_latex = symbols(r"\upsilon^{'''}")

# The curious case of pi:
# We don't have to create the symbol pi, as it is defined by sympy.
# We can use pi both symbolically and numerically.

alpha, ai, yn, beta_i_n, vttt, vttt_latex, pi, N(pi)