I've ran the tests from first and second comment using python 3.5.0 and it seems it produces correct results:

>>> import ast
>>> tree = ast.parse("sin(0.5)")
>>> first_stmt = tree.body[0]
>>> call = first_stmt.value
>>> print("col_offset of call expression:", call.col_offset)
col_offset of call expression: 0
>>> print("col_offset of func of the call:", call.func.col_offset)
col_offset of func of the call: 0

>>> tree = ast.parse("(sin\n(0.5))")
>>> first_stmt = tree.body[0]
>>> call = first_stmt.value
>>> print("col_offset of call expression:", call.col_offset)
col_offset of call expression: 1
>>> print("col_offset of func of the call:", call.func.col_offset)
col_offset of func of the call: 1
>>> print("lineno of call expression:", call.lineno)
lineno of call expression: 1
>>> print("lineno of func of the call:", call.lineno)
lineno of func of the call: 1