def soft_cast(value, cast_type):
"""
cast a value to a given type, if the cast fails, cast to null
Example:
>>> cast(None, int)
None
>>> cast('', int)
None
"""
try:
return cast(value, cast_type)
except (TypeError, ValueError):
pass
return tab.cast_null(value)
def soft_null_cast(value):
try:
tab.cast_null(value)
except TypeError:
return value