Following program gives correct result in Python versions older than 3.4, but incorrect result in 3.4:

----------------------
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)
print("col_offset of func of the call:", call.func.col_offset)
-----------------------

it should print:
col_offset of call expression: 0
col_offset of func of the call: 0

but in 3.4 it prints:
col_offset of call expression: 3
col_offset of func of the call: 0