*Detailed docs to come shortly.

Selects specified keys from the data dictionary. If a key does not exist in all records, it will be omitted from those records.

Parameters:

• *keys (Any): The keys to select. This can be any number of keys in the DataDict.

Returns:

• DataDict: A DataDict containing only the selected keys.

Filters the DataDict object based on the specified field and comparison. The DataDict object can be treated exactly like a list of dicts, but can also perform more complex queries.

Parameters:

• key (Any): The key to filter by. This can be any key found in the DataDict.
• comparison (str): The comparison operator to use. This can be any comparison operator found in the DataDict.
• value (Any): The value to compare the field to.

Returns:

• Datadict: A DataDict object containing the filtered dicts.

Converts the values of the specified key to floats. If conversion is not possible, raises a ValueError.
Modifies the DataDict in place.

Parameters:

• key (Any): The key whose values are to be converted to float.
  Modifies the DataDict in place.

Converts the values of the specified key to strings.
Modifies the DataDict in place.

Parameters:

• key (Any): The key whose values are to be converted to string.

Calculates the median of the numerical values in the specified key. If the key contains non-numeric values, raises a ValueError.

Parameters:

• key (Any): The key for which the median is to be calculated.

Returns:

• int | float: The median of the key values.

Calculates the mean of the numerical values in the specified key. If the key contains non-numeric values, raises a ValueError.

Parameters:

• key (Any): The key for which the mean is to be calculated.

Returns:

• int | float: The mean of the key values.

Calculates the maximum value out of all numerical values in the specified key. If the key contains non-numeric values, raises a ValueError.

Parameters:

• key (Any): The key for which the maximum value is to be calculated.

Returns:

• int | float: The maximum value of the key values.

Calculates the minimum value out of all numerical values in the specified key. If the key contains non-numeric values, raises a ValueError.

Parameters:

• key (Any): The key for which the minimum value is to be calculated.

Returns:

• int | float: The minimum value of the key values.

Returns the last n elements of the data dictionary.

Parameters:

• n (int): An integer specifying the number of elements to return from the end of the data dictionary (default is 5).

Returns:

• DataDict: A DataDict representing the last n elements.

Returns the first n elements of the data dictionary.

Parameters:

• n (int): An integer specifying the number of elements to return from the end of the data dictionary (default is 5).

Returns:

• DataDict: A DataDict representing the first n elements.