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To use the `Loan` and `Mortgage` classes from `classes.py` in another program, `main.py`, you would declare and import them as follows:

```python
# main.py

# Import the classes from classes.py
from classes import Loan, Mortgage

# Example usage
def main():
# Create an instance of the Loan class
loan_example = Loan("John Doe", 10000, 0.05, 60)

# Access some methods
print(loan_example.get_cust_name())
print(loan_example.get_monthly_payment())

# Create an instance of the Mortgage class
mortgage_example = Mortgage("Jane Doe", 200000, 0.04, 360, 250000, 0.01)

# Access some methods
print(mortgage_example.get_purchase_price())
print(mortgage_example.get_PMI_rate())

if __name__ == "__main__":
main()
```

In this `main.py` file, we:

1. Import the `Loan` and `Mortgage` classes from `classes.py`.
2. Define a `main` function where instances of both classes are created and their methods are called.
3. Use the `if __name__ == "__main__":` construct to ensure that the `main` function runs when the script is executed directly.

Answer :

Final answer:

To declare the classes from the `classes.py` file into the `main.py` file, you can use the `import` statement. Here is an example:

Explanation:

To declare the classes from the `classes.py` file into the `main.py` file, you can use the following steps:

  1. Create a new Python file named `main.py`.
  2. Use the `import` statement to import the classes from the `classes.py` file. In this case, you would import the `Loan` and `Mortgage` classes.
  3. Once the classes are imported, you can create instances of the classes and access their methods as needed.

Here is an example of how you can declare the classes in `classes.py` into `main.py`:

Learn more about declaring classes from one file into another in python here:

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