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Count Positive Numbers

Write a Python function `count_positive_numbers` that takes a list of integers as input and returns the count of positive numbers in the list. A positive number is any number greater than zero.

#### Example Usage
```python [main.nopy]
print(count_positive_numbers([1, -2, 3, -4]))  # Output: 2
print(count_positive_numbers([3, 4, 5, -1]))  # Output: 3
print(count_positive_numbers([1, 2, 3, 4]))   # Output: 4
```
def count_positive_numbers(numbers):
    """
    Count the number of positive numbers in a list.

    Args:
        numbers (list): A list of integers.

    Returns:
        int: The count of positive numbers in the list.
    """
    # Initialize a counter for positive numbers
    positive_count = 0

    # Iterate through the list and count positive numbers
    # (Placeholder for implementation)

    return positive_count
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