def exp_prob(expansion):
"""Return the options of an expansion"""
return exp_opt(expansion, 'prob')
def exp_post_expansion_function(expansion):
"""Return the specified post-expansion function, or None if unspecified"""
return exp_opt(expansion, 'post')
def exp_order(expansion):
"""Return the specified expansion ordering, or None if unspecified"""
return exp_opt(expansion, 'order')
def exp_pre_expansion_function(expansion):
"""Return the specified pre-expansion function, or None if unspecified"""
return exp_opt(expansion, 'pre')
