I tried this:
In [1]: from sympy.stats import ContinuousRV, P
In [2]: var('x')
Out[2]: x
In [3]: X = ContinuousRV(x, exp(-x), (0, oo))
In [4]: P(X < Rational(1,2))
TypeError: Input must be Sets or iterables of Sets
I get the right answer when avoiding the stats module:
In [6]: var('k')
Out[6]: k
In [7]: cdf = integrate(exp(-x), (x, 0, k))
In [8]: solve(cdf - Rational(1, 2), k)
Out[8]: [log(2)]
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