Q:

Calculating power for Decimals in Python

I want to calculate power for Decimal in Python like:
from decimal import Decimal
Decimal.power(2,2)

Above should return me as Decimal('2)
How can I calculate power for Decimals?
EDIT:
This is what i did 
y = Decimal('10')**(x-deci_x+Decimal(str(n))-Decimal('1'))

x,deci_x are of decimal type
but above expression is throwing error as:
decimal.InvalidOperation: x ** (non-integer)

Stacktrace:
Traceback (most recent call last):
  File "ha.py", line 28, in ?
    first_k_1=first_k(2,n-1,k)
  File "ha.py", line 18, in first_k
    y = Decimal('10')**(x-deci_x+Decimal(str(n))-Decimal('1'))
  File "/usr/lib64/python2.4/decimal.py", line 1709, in __pow__
    return context._raise_error(InvalidOperation, 'x ** (non-integer)')
  File "/usr/lib64/python2.4/decimal.py", line 2267, in _raise_error
    raise error, explanation

A:

You can calculate power using **:
2**3  # yields 8

a = Decimal(2)
a**2  # yields Decimal(4)

Following your update, seems okay for me:
>>> x = Decimal(2)
>>> deci_x = Decimal(1)
>>> n=4
>>> y = Decimal('10')**(x-deci_x+Decimal(str(n))-Decimal('1'))
>>> y
Decimal('10000')

A:

You can just use the power operator ** with Decimal...
print(Decimal(2)**Decimal(2)) # 4

Edit, followup to your question
You don't need to parse stings to Decimal()...
from decimal import Decimal
x, deci_x, n = Decimal(2), Decimal(3), 4
y = Decimal(10)**(x-deci_x+Decimal(n)-Decimal(1))
print(y) # 100

