Bitwise operations in Python?

[Carl]

Dear friends,

I am currently porting a fortran program to Python but am stuck on the
intrinsic IBITS function. 

Does anyone know about a replacement function for IBITS in Python?

Yours, Carl


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IBITS(I, POS, LEN)

Extracts a sequence of bits.

I
    must be of type integer.

POS
    must be of type integer. It must be nonnegative and POS + LEN must be
less than or equal to BIT_SIZE (I).

LEN
    must be of type integer and nonnegative. 

Class

Elemental function

Result Type and Attributes

Same as I.

Result Value

The result has the value of the sequence of LEN bits in I beginning at bit
POS, right-adjusted and with all other bits zero.

The bits are numbered from 0 to BIT_SIZE(I)-1, from right to left.

Examples

IBITS (14, 1, 3) has the value 7.