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# Python | sympy.euler () method

Using the sympy.euler () method we can find the number Euler and Euler polynomial in SymPy.
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### euler (n) —

Syntax: euler (n)

Parameter:
n - It denotes the nth Euler number.

Returns : Returns the n th Euler number.

Example # 1:

 ` # import sympy ` ` from ` ` sympy ` ` import ` ` * ` ` n ` ` = 4 `` print ( "Value of n = {}" . format (n))   # Use set the sympy.euler () method nth_euler = euler (n)     print ( "Value of nth euler number: {}" . format (nth_euler)) `

Exit :

` Value of n = 4 Value of nth euler number: 5 `

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### euler (n, k) —

Syntax: euler (n, k)

Parameter:
n - It denotes the order of the Euler polynomial.
k - It denotes the variable in the Euler polynomial.

Returns: Returns the expression of the Euler polynomial or its value.

Example # 2:

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 ` # import sympy ` ` from ` ` sympy ` ` import ` ` * ` ` n ` ` = ` ` 5 ` ` k ` ` = ` ` symbols (` `` x` ` `) ` ` print ` ` (` ` "Value of n = {} and k = {}" ` `. ` ` format ` ` (n, k)) ` ` `  ` # Use the sympy.euler () method ` ` nth_euler_poly ` ` = ` ` euler (n, k) `   ` print ` ` (` ` "The nth euler polynomial: {}" ` `. ` ` format ` ` (nth_euler_poly)) `

Exit:

` Value of n = 5 and k = x The nth euler polynomial: x ** 5 - 5 * x ** 4/2 + 5 * x ** 2/2 - 1/2 `

Example # 3:

 ` # import sympy ` ` from ` ` sympy ` ` import ` ` * ` ` n ` ` = ` ` 4 ` ` k ` ` = ` ` 3 ` ` print ( "Value of n = {} and k = {}" . format (n, k)) ``   # Use the sympy.euler () method nth_euler_poly = euler (n, k)    print ( "The nth euler polynomial value: {}" . format (nth_euler_poly))  `

Exit:

` Value of n = 4 and k = 3 The nth euler polynomial value: 30 `