featuretools.primitives.TimeSinceFirst

class featuretools.primitives.TimeSinceFirst(unit='seconds')

计算自第一个日期时间以来的时间（以秒为单位）.

Description:

给定一个日期时间列表,计算自第一个日期时间以来的时间（以秒为单位）. 使用实例的截止时间.

Parameters:

unit (str) – 定义时间计量的单位. 默认为秒.可接受的值: 年、月、日、小时、分钟、秒、毫秒、纳秒

Examples

>>> from datetime import datetime
>>> time_since_first = TimeSinceFirst()
>>> cutoff_time = datetime(2010, 1, 1, 12, 0, 0)
>>> times = [datetime(2010, 1, 1, 11, 45, 0),
...          datetime(2010, 1, 1, 11, 55, 15),
...          datetime(2010, 1, 1, 11, 57, 30)]
>>> time_since_first(times, time=cutoff_time)
900.0

>>> from datetime import datetime
>>> time_since_first = TimeSinceFirst(unit = "minutes")
>>> cutoff_time = datetime(2010, 1, 1, 12, 0, 0)
>>> times = [datetime(2010, 1, 1, 11, 45, 0),
...          datetime(2010, 1, 1, 11, 55, 15),
...          datetime(2010, 1, 1, 11, 57, 30)]
>>> time_since_first(times, time=cutoff_time)
15.0

__init__(unit='seconds')

Methods

__init__([unit])
flatten_nested_input_types(input_types)	将嵌套的列模式输入展平成一个列表.
generate_name(base_feature_names, ...)
generate_names(base_feature_names, ...)
get_args_string()
get_arguments()
get_description(input_column_descriptions[, ...])
get_filepath(filename)
get_function()

Attributes

base_of
base_of_exclude
commutative
default_value	Default value this feature returns if no data found.
description_template
input_types	woodwork.ColumnSchema types of inputs
max_stack_depth
name	Name of the primitive
number_output_features	Number of columns in feature matrix associated with this feature
return_type	ColumnSchema type of return
stack_on
stack_on_exclude
stack_on_self
uses_calc_time