Calculate the Euler Number with more decimal places

[Gribouillis]

What linux distribution do you have ?
In Ubuntu I have a package python3-gmpy2, also if I only want the header gmp.h, I can install the package libgmp-dev. The Gnu Multiprecision Library can be installed on any Linux computer.

Also note that other libraries exist for multiprecision, such as mpmath, which is used by sympy and sage I think, and there is also bigfloat and clnum.

>>> from sympy import *
>>> x = symbols('x')
>>> exp(x).evalf(100, subs={x: Float('1.0')})
2.718281828459045235360287471352662497757247093699959574966967627724076630353547594571382178525166427
>>>