To create and manipulate JSON files in Python, you can use the built-in json module. Here is an example of how you can create a new JSON file and write some data to it:

```python
import json

data = {
    "name": "John",
    "age": 30,
    "city": "New York"
}

with open("data.json", "w") as f:
    json.dump(data, f)
```

In the example above, we first define a Python dictionary called data that contains some information. We then open a new file called data.json in write mode using the with statement, and use the json.dump() function to write the data to the file in JSON format.

To read data from a JSON file, you can use the json.load() function. Here is an example:

```python
import json

with open("data.json", "r") as f:
    data = json.load(f)

print(data["name"]) # prints "John"
print(data["age"]) # prints 30
print(data["city"]) # prints "New York"
```

In the example above, we use the with statement to open the data.json file in read mode, and then use the json.load() function to read the data from the file into a Python dictionary called data. We can then access the data in the dictionary using the keys.

To update the data in a JSON file, you can read the file into a Python dictionary, update the values, and then write the updated dictionary back to the file using the json.dump() function. Here is an example:

```python
import json

with open("data.json", "r") as f:
    data = json.load(f)

data["age"] = 31

with open("data.json", "w") as f:
    json.dump(data, f)
```

In the example above, we first read the data from the data.json file into a dictionary called data. We then update the value of the age key to 31, and write the updated dictionary back to the file using the json.dump() function.
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