Method on @sym: isNone (x) ¶

Return true if symbolic expression is Python object None.

Python has a None object.

Example:

a = pycall_sympy__ ('return None')
  ⇒ a = (sym) None
isNone(a)
  ⇒ ans =  1

See also: @sym/isnan, @sym/isinf.

Package: symbolic