examples/substitution.py

   1 import sys
   2 sys.path.append("..")
   3
   4 import sympy
   5 x=sympy.Symbol('x')
   6 y=sympy.Symbol('y')
   7 e=1/sympy.cos(x)
   8 print e
   9 print e.subs(sympy.cos(x),y)
  10 print e.subs(sympy.cos(x),y).subs(y,x**2)
  11 e=1/sympy.log(x)
  12 e=e.subs(x,sympy.Real("2.71828"))
  13 print e
  14 print e.evalf()