API

dataclassframe

class dataclassframe.DataClassFrame(*args, **kwds)

__init__(record_class: Type[RecordT], data: Iterable[RecordT], index: Union[None, str, List[str]] = None)

Container of dataclasses.

Parameters

• record_class – The dataclasses class of each record

• data – An iterable of dataclass records

• index – Fields of the dataclass to use as indexes

copy(deep: bool = True) → dataclassframe.dataclassframe_.DataClassFrame[RecordT]

Copy self

Parameters

deep – Perform deep copy or not

Returns: copy of DataClassFrame

classmethod from_dataframe(record_class: Type[RecordT], dataframe: Optional[pandas.core.frame.DataFrame] = None, index: Union[None, str, List[str]] = None)

Create a DataClassFrame using a Pandas DataFrame

Parameters

• record_class – The dataclasses class of each record

• dataframe – A Pandas DataFrame of dataframe

• index – Fields of the dataclass to use as indexes

Returns: DataClassFrame

head(n: int = 5) → dataclassframe.dataclassframe_.DataClassFrame[RecordT]

Provide first n rows of self

Parameters

n – First n rows to output

Returns: DataClassFrame of head

to_dataframe() → pandas.core.frame.DataFrame

Convert to dataframe. Copy dataframe to prevent side-effects.

Returns: Pandas DataFrame of same dataframe

property at

Access or set a single element using a dictionary like key(s). The key or key combination must index a unique record otherwise a KeyError is raised.

Returns: A record of type RecordT

Examples

Access record ‘a’ using the first field index:

>>> self.at['a']

Access record ‘b’ using the second field index:

>>> self.at[:, 'b']

Access record with joint key (‘c’, ‘d’):

>>> self.at['c', 'd']

Set record with joint key (‘a’, ‘f’):

>>> self.at['a', 'f'] = RecordT(foo='a', bar='f')

property cols

Access or set a column as a Pandas Series

Returns

Pandas Series of column

Examples

Access column a:

>>> self.cols.a

Sum column a:

>>> self.cols.a.sum()

Set all values in column a to 0:

>>> self.cols.a = 0

property iat

Access or set a single element using positional index.

Returns: A record of type RecordT

Examples

Access second element:

>>> self.iat[1]

Access last element:

>>> self.iat[-1]

Set record at position 0:

>>> self.iat[0] = RecordT(foo='a', bar=1)