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### 此方法问题
def _write_group_header(self, row, column, label, group, group_depth=0):
aggregates = group.aggregated_values
label = '%s%s (%s)' % (' ' * group_depth, label, group.count)
self.write(row, column, label, self.header_bold_style)
for field in self.fields[1:]: # No aggregates allowed in the first column because of the group title
column += 1
aggregated_value = aggregates.get(field['name'])
# Non-stored float fields may not be displayed properly because of float representation
# => we force 2 digits
# if not field.get('store') and isinstance(aggregated_value, float):
# 上一行为原生， ， ， ， ，
if isinstance(aggregated_value, float):
aggregated_value = float_repr(aggregated_value, 2)
self.write(row, column, str(aggregated_value if aggregated_value is not None else ''), self.header_bold_style)
return row + 1, 0