cf.Data.__nonzero__

Data.__nonzero__()

Truth value testing and the built-in operation bool

x.__nonzero__() <==> x != 0

Examples:

>>> bool(cf.Data(1))
True
>>> bool(cf.Data([[False]]))
False
>>> bool(cf.Data([1, 2]))
ValueError: The truth value of Data with more than one element is ambiguous. Use d.any() or d.all()