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Python | sympy.subs() method

  • Last Updated : 12 Jun, 2019

With the help of sympy.subs() method, we can substitute the value of variables in the various mathematical functions by using the sympy.subs() method.

Syntax : sympy.subs(source, destination)
Return : Return the same expression by changing the variable.

Example #1 :

In this example we can see that by using the sympy.subs() method, we can substitute the value of existing variable to the new variable.




# import sympy
from sympy import *
  
# symbol declaration
x, y = symbols('x y')
  
gfg_exp = cos(x) + 1
  
# use the method sympy.subs()
gfg_exp = gfg_exp.subs(x, y)
  
print(gfg_exp)

Output :

cos(y) + 1

Example #2 :




# import sympy
from sympy import *
  
# symbol declaration
x, y = symbols('x y')
  
gfg_exp = cos(x) + 1
  
# use the method sympy.subs()
gfg_exp = gfg_exp.subs(x, 0)
  
print(gfg_exp)

Output :

2

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