featuretools.primitives.CountString#

class featuretools.primitives.CountString(string='the', ignore_case=True, ignore_non_alphanumeric=False, is_regex=False, match_whole_words_only=False)[source]#

确定给定字符串在文本字段中出现的次数.

Parameters:

  • string (str) – 要确定计数的字符串.默认为单词 “the”.

  • ignore_case (bool) – 确定是否应考虑字符串的大小写.默认为 True.

  • ignore_non_alphanumeric (bool) – 确定是否应在搜索中使用非字母数字字符.默认为 False.

  • is_regex (bool) – 定义字符串参数是否为正则表达式.默认为 False.

  • match_whole_words_only (bool) – 确定是否应仅匹配整个单词.例如,在搜索单词 the 时, 如果此参数为 True,则仅返回 the.默认为 False.

Examples

>>> count_string = CountString(string="the")
>>> count_string(["The problem was difficult.",
...               "He was there.",
...               "The girl went to the store."]).tolist()
[1.0, 1.0, 2.0]
>>> # 匹配字符串的大小写
>>> count_string_ignore_case = CountString(string="the", ignore_case=False)
>>> count_string_ignore_case(["The problem was difficult.",
...                           "He was there.",
...                           "The girl went to the store."]).tolist()
[0.0, 1.0, 1.0]
>>> # 忽略搜索中的非字母数字字符
>>> count_string_ignore_non_alphanumeric = CountString(string="the",
...                                                    ignore_non_alphanumeric=True)
>>> count_string_ignore_non_alphanumeric(["Th*/e problem was difficult.",
...                                       "He was there.",
...                                       "The girl went to the store."]).tolist()
[1.0, 1.0, 2.0]
>>> # 将字符串指定为正则表达式
>>> count_string_is_regex = CountString(string="t.e", is_regex=True)
>>> count_string_is_regex(["The problem was difficult.",
...                        "He was there.",
...                        "The girl went to the store."]).tolist()
[1.0, 1.0, 2.0]
>>> # 仅匹配整个单词
>>> count_string_match_whole_words_only = CountString(string="the",
...                                                   match_whole_words_only=True)
>>> count_string_match_whole_words_only(["The problem was difficult.",
...                                      "He was there.",
...                                      "The girl went to the store."]).tolist()
[1.0, 0.0, 2.0]
__init__(string='the', ignore_case=True, ignore_non_alphanumeric=False, is_regex=False, match_whole_words_only=False)[source]#

Methods

__init__([string, ignore_case, ...])

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()

process_text(text)

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

uses_full_dataframe