To create, read, and write JSON files in Python, you can use the built-in json module. Here's an example of how to create a JSON file with Python:

```python
import json

# Sample data to be written to the JSON file
data = {
    "name": "John",
    "age": 30,
    "city": "New York"
}

# Open a file in write mode
with open('data.json', 'w') as file:
    # Write the data to the file using the json.dump() method
    json.dump(data, file)
```
In this example, we import the json module and create a dictionary data that we want to write to a file in JSON format. We then use the open() function to open a file named data.json in write mode, and use the json.dump() method to write the data to the file in JSON format.

To read the JSON data from a file, you can use the json.load() method, like this:

```python
# Open the file in read mode
with open('data.json', 'r') as file:
    # Load the data from the file using the json.load() method
    data = json.load(file)

# Print the loaded data
print(data)
```
In this example, we open the data.json file in read mode, and use the json.load() method to load the data from the file into a variable named data. We then print the loaded data to the console.

To update the data in a JSON file, you can first read the data from the file using the json.load() method, update the data as needed, and then write the updated data back to the file using the json.dump() method. Here's an example:

```python
# Open the file in read mode
with open('data.json', 'r') as file:
    # Load the data from the file using the json.load() method
    data = json.load(file)

# Update the data
data["age"] = 31

# Open the file in write mode
with open('data.json', 'w') as file:
    # Write the updated data to the file using the json.dump() method
    json.dump(data, file)
```

In this example, we first read the data from the data.json file into the data variable using the json.load() method. We then update the value of the "age" key in the data dictionary. Finally, we open the data.json file in write mode, and use the json.dump() method to write the updated data back to the file in JSON format.
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