Positive Ratio in Array

Write a Python function `positive_ratio(nums)` that takes a list of integers `nums` and returns the ratio of positive numbers in the list. The ratio should be rounded to two decimal places.

#### Example Usage
```python [main.nopy]
positive_ratio([0, 1, 2, -1, -5, 6, 0, -3, -2, 3, 4, 6, 8])
# Output: 0.54

positive_ratio([2, 1, 2, -1, -5, 6, 4, -3, -2, 3, 4, 6, 8])
# Output: 0.69

positive_ratio([2, 4, -6, -9, 11, -12, 14, -5, 17])
# Output: 0.56
```

#### Constraints
- The input list will contain at least one integer.
- The function should handle both positive and negative integers, as well as zeros.
def positive_ratio(nums):
    """
    Calculate the ratio of positive numbers in the list.

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

    Returns:
        float: The ratio of positive numbers rounded to two decimal places.
    """
    # Placeholder for the solution
    pass
Intermediate listsmathfunctionsloops
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