def parse_columns(dataset, formula, name, dframe=None, no_index=False):
"""Parse a formula and return columns resulting from its functions.
Parse a formula into a list of functions then apply those functions to
the Data Frame and return the resulting columns.
:param formula: The formula to parse.
:param name: Name of the formula.
:param dframe: A DataFrame to apply functions to.
:param no_index: Drop the index on result columns.
"""
functions = Parser.parse_functions(formula)
dependent_columns = Parser.dependent_columns(formula, dataset)
# make select from dependent_columns
if dframe is None:
select = {col: 1 for col in dependent_columns or [MONGO_ID]}
dframe = dataset.dframe(
query_args=QueryArgs(select=select),
keep_mongo_keys=True).set_index(MONGO_ID_ENCODED)
if not dependent_columns:
# constant column, use dummy
dframe['dummy'] = 0
return __build_columns(dataset, dframe, functions, name, no_index)
def parse_columns(dataset, formula, name, dframe=None, no_index=False):
"""Parse a formula and return columns resulting from its functions.
Parse a formula into a list of functions then apply those functions to
the Data Frame and return the resulting columns.
:param formula: The formula to parse.
:param name: Name of the formula.
:param dframe: A DataFrame to apply functions to.
:param no_index: Drop the index on result columns.
"""
functions = Parser.parse_functions(formula)
dependent_columns = Parser.dependent_columns(formula, dataset)
# make select from dependent_columns
if dframe is None:
select = {col: 1 for col in dependent_columns or [MONGO_ID]}
dframe = dataset.dframe(
query_args=QueryArgs(select=select),
keep_mongo_keys=True).set_index(MONGO_ID_ENCODED)
if not dependent_columns:
# constant column, use dummy
dframe['dummy'] = 0
return __build_columns(dataset, dframe, functions, name, no_index)
def _parse_and_check_func(self, formula):
functions = Parser.parse_functions(formula)
for func in functions:
self.assertEqual(func.func.func_name, "eval")
return functions[0]
def _parse_and_check_func(self, formula):
functions = Parser.parse_functions(formula)
for func in functions:
self.assertEqual(func.func.func_name, 'eval')
return functions[0]