spaCy/website/docs/api/stringstore.md
2020-05-24 17:23:00 +02:00

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---
title: StringStore
tag: class
source: spacy/strings.pyx
---
Look up strings by 64-bit hashes. As of v2.0, spaCy uses hash values instead of
integer IDs. This ensures that strings always map to the same ID, even from
different `StringStores`.
## StringStore.\_\_init\_\_ {#init tag="method"}
Create the `StringStore`.
> #### Example
>
> ```python
> from spacy.strings import StringStore
> stringstore = StringStore(["apple", "orange"])
> ```
| Name | Type | Description |
| ----------- | ------------- | -------------------------------------------------- |
| `strings` | iterable | A sequence of unicode strings to add to the store. |
| **RETURNS** | `StringStore` | The newly constructed object. |
## StringStore.\_\_len\_\_ {#len tag="method"}
Get the number of strings in the store.
> #### Example
>
> ```python
> stringstore = StringStore(["apple", "orange"])
> assert len(stringstore) == 2
> ```
| Name | Type | Description |
| ----------- | ---- | ----------------------------------- |
| **RETURNS** | int | The number of strings in the store. |
## StringStore.\_\_getitem\_\_ {#getitem tag="method"}
Retrieve a string from a given hash, or vice versa.
> #### Example
>
> ```python
> stringstore = StringStore(["apple", "orange"])
> apple_hash = stringstore["apple"]
> assert apple_hash == 8566208034543834098
> assert stringstore[apple_hash] == "apple"
> ```
| Name | Type | Description |
| -------------- | ------------------------ | -------------------------- |
| `string_or_id` | bytes, unicode or uint64 | The value to encode. |
| **RETURNS** | str or int | The value to be retrieved. |
## StringStore.\_\_contains\_\_ {#contains tag="method"}
Check whether a string is in the store.
> #### Example
>
> ```python
> stringstore = StringStore(["apple", "orange"])
> assert "apple" in stringstore
> assert not "cherry" in stringstore
> ```
| Name | Type | Description |
| ----------- | ---- | -------------------------------------- |
| `string` | str | The string to check. |
| **RETURNS** | bool | Whether the store contains the string. |
## StringStore.\_\_iter\_\_ {#iter tag="method"}
Iterate over the strings in the store, in order. Note that a newly initialized
store will always include an empty string `''` at position `0`.
> #### Example
>
> ```python
> stringstore = StringStore(["apple", "orange"])
> all_strings = [s for s in stringstore]
> assert all_strings == ["apple", "orange"]
> ```
| Name | Type | Description |
| ---------- | ---- | ---------------------- |
| **YIELDS** | str | A string in the store. |
## StringStore.add {#add tag="method" new="2"}
Add a string to the `StringStore`.
> #### Example
>
> ```python
> stringstore = StringStore(["apple", "orange"])
> banana_hash = stringstore.add("banana")
> assert len(stringstore) == 3
> assert banana_hash == 2525716904149915114
> assert stringstore[banana_hash] == "banana"
> assert stringstore["banana"] == banana_hash
> ```
| Name | Type | Description |
| ----------- | ------ | ------------------------ |
| `string` | str | The string to add. |
| **RETURNS** | uint64 | The string's hash value. |
## StringStore.to_disk {#to_disk tag="method" new="2"}
Save the current state to a directory.
> #### Example
>
> ```python
> stringstore.to_disk("/path/to/strings")
> ```
| Name | Type | Description |
| ------ | ------------ | --------------------------------------------------------------------------------------------------------------------- |
| `path` | str / `Path` | A path to a directory, which will be created if it doesn't exist. Paths may be either strings or `Path`-like objects. |
## StringStore.from_disk {#from_disk tag="method" new="2"}
Loads state from a directory. Modifies the object in place and returns it.
> #### Example
>
> ```python
> from spacy.strings import StringStore
> stringstore = StringStore().from_disk("/path/to/strings")
> ```
| Name | Type | Description |
| ----------- | ------------- | -------------------------------------------------------------------------- |
| `path` | str / `Path` | A path to a directory. Paths may be either strings or `Path`-like objects. |
| **RETURNS** | `StringStore` | The modified `StringStore` object. |
## StringStore.to_bytes {#to_bytes tag="method"}
Serialize the current state to a binary string.
> #### Example
>
> ```python
> store_bytes = stringstore.to_bytes()
> ```
| Name | Type | Description |
| ----------- | ----- | ------------------------------------------------ |
| **RETURNS** | bytes | The serialized form of the `StringStore` object. |
## StringStore.from_bytes {#from_bytes tag="method"}
Load state from a binary string.
> #### Example
>
> ```python
> fron spacy.strings import StringStore
> store_bytes = stringstore.to_bytes()
> new_store = StringStore().from_bytes(store_bytes)
> ```
| Name | Type | Description |
| ------------ | ------------- | ------------------------- |
| `bytes_data` | bytes | The data to load from. |
| **RETURNS** | `StringStore` | The `StringStore` object. |
## Utilities {#util}
### strings.hash_string {#hash_string tag="function"}
Get a 64-bit hash for a given string.
> #### Example
>
> ```python
> from spacy.strings import hash_string
> assert hash_string("apple") == 8566208034543834098
> ```
| Name | Type | Description |
| ----------- | ------ | ------------------- |
| `string` | str | The string to hash. |
| **RETURNS** | uint64 | The hash. |