def read_is_short_restricted(field):
"""Return True if the stock cannot be sold short."""
if field != "":
if field == 'Y':
return True
if field == 'N':
return False
else:
raise UnexpectedField(
"Unknown Value in Short Restricted Field: %s" % field)
else:
return False
def read_tick_direction(field):
"""
1 if last tick was an uptick, -1 for downtick, 0 for zero-tick.
Throws a BadField exception if
"""
if field != "":
field_as_int = int(field)
if field_as_int == 173:
return np.int8(1)
if field_as_int == 175:
return np.int8(-1)
if field_as_int == 183:
return np.int8(0)
else:
raise UnexpectedField(
"Unknown value in Tick Direction Field: %s" % field)
else:
return np.int8(0)