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docs(string_tokenizer_count): add description for exercise

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eslopfer 2 years ago
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      subjects/devops/string_tokenizer_count/README.md

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## string_tokenizer_count
### Instructions
Create a file string_tokenizer_count.py that contains a function tokenizer_counter which takes in a string as a parameter and returns a dictionary of words and their count in the string.
- The function should remove any punctuation from the string and convert it to lowercase before counting the words.
- The function should return a dictionary of words and their count, sorted alphabetically by word.
### Usage
Here is an example of how to use the function:
```python
string = "This is a test sentence, with various words and 123 numbers!"
result = tokenizer_counter(string)
print(string)
```
And its output:
```console
string = "This is a test sentence, with various words and 123 numbers!"
result = tokenizer_counter(string)
```
### Hints
- The `re` module can be used to remove non-alphanumeric characters.
- The `collections` module can be used to count the words.
- The `operator` module can be used to sort the dictionary alphabetically by word.
### References
- [`re` module](https://docs.python.org/3/library/re.html)
- [`collections` module](https://docs.python.org/3/library/collections.html)
- [`operator` module](https://docs.python.org/3/library/operator.html)
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