Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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The add() method resizes the array properly when items are added to the array.

In the arraybag.py file define the add() method in the ArrayBag class by completing the following:

  1. Check array memory and increase it if necessary

To test your program run the test() method in the testbag.py file.

Your program's output should look like the following:

### Educational Content: Implementing Dynamic Arrays in Python

#### Instructions

The `add()` method is designed to dynamically resize the array when new items are added. Follow these steps to implement the `add()` method in the `ArrayBag` class within the `arraybag.py` file:

1. **Check Array Capacity**: Ensure that there is enough memory and increase the array size if necessary.

#### Testing the Implementation

To test your implementation, execute the `test()` method in the `testbag.py` file.

---

#### Code Overview

```python
class ArrayBag(object):
    """An array-based bag implementation."""

    # Class variable
    DEFAULT_CAPACITY = 10

    # Constructor
    def __init__(self, sourceCollection=None):
        """Sets the initial state of self, which includes the contents
        of sourceCollection, if it's present."""
        self.items = Array(ArrayBag.DEFAULT_CAPACITY)
        self.size = 0
        if sourceCollection:
            for item in sourceCollection:
                self.add(item)
```

#### Explanation

- **Class Definition**: The `ArrayBag` class is an implementation of a bag using arrays.
  
- **DEFAULT_CAPACITY**: It is a class variable that sets the default size of the array to 10.

- **Constructor (`__init__` method)**:
  - Initializes the `items` array with the default capacity.
  - Sets the initial size of the bag to 0.
  - If a `sourceCollection` is provided, it iterates through each item and adds it to the bag using the `add()` method.

#### Terminal Execution

The terminal snapshot shows the command used to run the Python script:

```bash
sandbox $ python3 arraybag.py
sandbox $
```

This indicates the execution of the `arraybag.py` script in a Python 3 environment.
expand button
Transcribed Image Text:### Educational Content: Implementing Dynamic Arrays in Python #### Instructions The `add()` method is designed to dynamically resize the array when new items are added. Follow these steps to implement the `add()` method in the `ArrayBag` class within the `arraybag.py` file: 1. **Check Array Capacity**: Ensure that there is enough memory and increase the array size if necessary. #### Testing the Implementation To test your implementation, execute the `test()` method in the `testbag.py` file. --- #### Code Overview ```python class ArrayBag(object): """An array-based bag implementation.""" # Class variable DEFAULT_CAPACITY = 10 # Constructor def __init__(self, sourceCollection=None): """Sets the initial state of self, which includes the contents of sourceCollection, if it's present.""" self.items = Array(ArrayBag.DEFAULT_CAPACITY) self.size = 0 if sourceCollection: for item in sourceCollection: self.add(item) ``` #### Explanation - **Class Definition**: The `ArrayBag` class is an implementation of a bag using arrays. - **DEFAULT_CAPACITY**: It is a class variable that sets the default size of the array to 10. - **Constructor (`__init__` method)**: - Initializes the `items` array with the default capacity. - Sets the initial size of the bag to 0. - If a `sourceCollection` is provided, it iterates through each item and adds it to the bag using the `add()` method. #### Terminal Execution The terminal snapshot shows the command used to run the Python script: ```bash sandbox $ python3 arraybag.py sandbox $ ``` This indicates the execution of the `arraybag.py` script in a Python 3 environment.
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