import pandas as pd
import dtale.global_state as global_state
from dtale.utils import make_list, run_query
[docs]def flatten_columns(df, columns=None):
if columns is not None:
return [
" ".join(
[
"{}-{}".format(c1, str(c2))
for c1, c2 in zip(make_list(columns), make_list(col_val))
]
).strip()
for col_val in df.columns.values
]
return [
" ".join([str(c) for c in make_list(col)]).strip() for col in df.columns.values
]
[docs]class DataReshaper(object):
def __init__(self, data_id, shape_type, cfg):
self.data_id = data_id
if shape_type == "pivot":
self.builder = PivotBuilder(cfg)
elif shape_type == "aggregate":
self.builder = AggregateBuilder(cfg)
elif shape_type == "transpose":
self.builder = TransposeBuilder(cfg)
else:
raise NotImplementedError(
"{} data re-shaper not implemented yet!".format(shape_type)
)
[docs] def reshape(self):
data = run_query(
global_state.get_data(self.data_id),
(global_state.get_settings(self.data_id) or {}).get("query"),
global_state.get_context_variables(self.data_id),
)
return self.builder.reshape(data)
[docs] def build_code(self):
return self.builder.build_code()
[docs]class PivotBuilder(object):
def __init__(self, cfg):
self.cfg = cfg
[docs] def reshape(self, data):
index, columns, values, aggfunc = (
self.cfg.get(p) for p in ["index", "columns", "values", "aggfunc"]
)
pivot_data = pd.pivot_table(
data, values=values, index=index, columns=columns, aggfunc=aggfunc
)
if len(values) == 1:
pivot_data.columns = pivot_data.columns.droplevel(0)
if self.cfg.get("columnNameHeaders", False):
pivot_data.columns = flatten_columns(pivot_data, columns=columns)
else:
pivot_data.columns = flatten_columns(pivot_data)
pivot_data = pivot_data.rename_axis(None, axis=1)
return pivot_data
[docs] def build_code(self):
index, columns, values, aggfunc = (
self.cfg.get(p) for p in ["index", "columns", "values", "aggfunc"]
)
code = []
if aggfunc is not None or len(values) > 1:
code.append(
"df = pd.pivot_table(df, index='{}', columns='{}', values=['{}'], aggfunc='{}')".format(
index, columns, "', '".join(values), aggfunc
)
)
if len(values) > 1:
code.append(
"df.columns = [' '.join([str(c) for c in col]).strip() for col in df.columns.values]"
)
elif len(values) == 1:
code.append("df.columns = df.columns.droplevel(0)")
else:
code.append(
"df = df.pivot(index='{index}', columns='{columns}', values='{values}')".format(
index=index, columns=columns, values=values[0]
)
)
code.append("df = df.rename_axis(None, axis=1)")
return "\n".join(code)
[docs]class AggregateBuilder(object):
def __init__(self, cfg):
self.cfg = cfg
[docs] def reshape(self, data):
index, agg = (self.cfg.get(p) for p in ["index", "agg"])
agg_data = data.groupby(index)
agg_type, func, cols = (agg.get(p) for p in ["type", "func", "cols"])
if agg_type == "func":
if cols:
agg_data = agg_data[cols]
return getattr(agg_data, func)()
agg_data = agg_data.aggregate(cols)
agg_data.columns = flatten_columns(agg_data)
return agg_data
[docs] def build_code(self):
index, agg = (self.cfg.get(p) for p in ["index", "agg"])
index = "', '".join(index)
agg_type, func, cols = (agg.get(p) for p in ["type", "func", "cols"])
if agg_type == "func":
if cols is not None:
return "df = df.groupby(['{index}'])['{columns}'].{agg}()".format(
index=index, columns="', '".join(cols), agg=agg
)
return "df = df.groupby(['{index}']).{agg}()".format(
index="', '".join(index), agg=agg
)
code = [
"df = df.groupby(['{index}']).aggregate(".format(index=index) + "{",
",\n".join(
"\t'{col}': ['{aggs}']".format(col=col, aggs="', '".join(aggs))
for col, aggs in cols.items()
),
"})",
"df.columns = [' '.join([str(c) for c in col]).strip() for col in df.columns.values]",
]
return "\n".join(code)
[docs]class TransposeBuilder(object):
def __init__(self, cfg):
self.cfg = cfg
[docs] def reshape(self, data):
index, columns = (self.cfg.get(p) for p in ["index", "columns"])
t_data = data.set_index(index)
if any(t_data.index.duplicated()):
raise Exception(
"Transposed data contains duplicates, please specify additional index or filtering"
)
if columns is not None:
t_data = t_data[columns]
t_data = t_data.T
if len(index) > 1:
t_data.columns = flatten_columns(t_data)
t_data = t_data.rename_axis(None, axis=1)
return t_data
[docs] def build_code(self):
index, columns = (self.cfg.get(p) for p in ["index", "columns"])
code = []
if columns is not None:
code.append(
"df = df.set_index('{}')['{}'].T".format(
"', '".join(index), "', '".join(columns)
)
)
else:
code.append("df = df.set_index('{}').T".format("', '".join(index)))
if len(index) > 1:
code.append(
"df.columns = [' '.join([str(c) for c in col]).strip() for col in df.columns.values]"
)
code.append("df = df.rename_axis(None, axis=1)")
return "\n".join(code)