write me script that shows the saves a dictionnary in json format in a file in python
```py
import json

# Define the dictionary
data = {
    name: John Doe,
    age: 30,
    city: New York
}

# Open the file for writing
with open(data.json, w) as file:
    # Write the dictionary to the file in JSON format
    json.dump(data, file)
    
print(Data saved successfully!)
```