[New] Parse Tuple in the Expression

[Thirumalai-Shaktivel]

Example:

print("%s%s%s" % (10 + x, y, z + 20))

Error:

$ lpython --show-ast --new-parser examples/expr2.py
syntax error: Token ',' is unexpected here
 --> examples/expr2.py:2:25
  |
2 | print("%s%s%s" % (10 + x, y, z + 20))
  |                         ^ 


Note: if any of the above error or warning messages are not clear or are lacking
context please report it to us (we consider that a bug that needs to be fixed).

[Thirumalai-Shaktivel]

Other examples:

if sys.version_info >= (3, 9):
    pass

NDArray = _GenericAlias(np.ndarray, (Any, _DType))

@pytest.mark.parametrize("shape", [(5), (3, 3, 3)])
def test():
    pass

_promotion_table = { (int8, int8): int8 }