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Count Uppercase Characters

Write a Python function `count_uppercase` that takes a string as input and returns the number of uppercase characters in the string.

#### Example Usage
```python [main.nopy]
print(count_uppercase("Hello World"))  # Output: 2
print(count_uppercase("python"))       # Output: 0
print(count_uppercase("PYTHON"))      # Output: 6
```
def count_uppercase(s: str) -> int:
    """
    Count the number of uppercase characters in the given string.

    Args:
        s (str): The input string.

    Returns:
        int: The count of uppercase characters.
    """
    # Initialize a counter for uppercase characters
    count = 0
    # Iterate through each character in the string
    for char in s:
        # Check if the character is uppercase
        if char.isupper():
            # Increment the counter
            count += 1
    # Return the final count
    return count
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