def Exponential(lamda, tag=None):
assert lamda > <NUM_LIT:0>, '<STR_LIT>'<EOL>return uv(ss.expon(scale=<NUM_LIT:1.0> / lamda), tag=tag)<EOL>
An Exponential random variate

Parameters
----------
lamda : scalar
    The inverse scale (as shown on Wikipedia). (FYI: mu = 1/lamda.)