Source code for tsfresh.utilities.string_manipulation

# -*- coding: utf-8 -*-
# This file as well as the whole tsfresh package are licenced under the MIT licence (see the LICENCE.txt)
# Maximilian Christ (, Blue Yonder Gmbh, 2016

import ast

import numpy as np

[docs]def get_config_from_string(parts): """ Helper function to extract the configuration of a certain function from the column name. The column name parts (split by "__") should be passed to this function. It will skip the kind name and the function name and only use the parameter parts. These parts will be split up on "_" into the parameter name and the parameter value. This value is transformed into a python object (for example is "(1, 2, 3)" transformed into a tuple consisting of the ints 1, 2 and 3). Returns None of no parameters are in the column name. :param parts: The column name split up on "__" :type parts: list :return: a dictionary with all parameters, which are encoded in the column name. :rtype: dict """ relevant_parts = parts[2:] if not relevant_parts: return config_kwargs = [s.rsplit("_", 1)[0] for s in relevant_parts] config_values = [s.rsplit("_", 1)[1] for s in relevant_parts] dict_if_configs = {} for key, value in zip(config_kwargs, config_values): if value.lower() == "nan": dict_if_configs[key] = np.NaN elif value.lower() == "-inf": dict_if_configs[key] = np.NINF elif value.lower() == "inf": dict_if_configs[key] = np.PINF else: dict_if_configs[key] = ast.literal_eval(value) return dict_if_configs
[docs]def convert_to_output_format(param): """ Helper function to convert parameters to a valid string, that can be used in a column name. Does the opposite which is used in the from_columns function. The parameters are sorted by their name and written out in the form <param name>_<param value>__<param name>_<param value>__ ... If a <param_value> is a string, this method will wrap it with parenthesis ", so "<param_value>" :param param: The dictionary of parameters to write out :type param: dict :return: The string of parsed parameters :rtype: str """ def add_parenthesis_if_string_value(x): if isinstance(x, str): return '"' + str(x) + '"' else: return str(x) return "__".join( str(key) + "_" + add_parenthesis_if_string_value(param[key]) for key in sorted(param.keys()) )