分别统计一行字符中英文大写字母和小写字母、空格的个数

统计一行字符中英文大写字母、小写字母和空格的个数可以使用编程语言来完成，例如Python。下面是一个简单的示例：

def count_chars(line):
    uppercase = sum(1 for char in line if char.isupper())
    lowercase = sum(1 for char in line if char.islower())
    whitespace = sum(1 for char in line if char.isspace())

    return uppercase, lowercase, whitespace

# 测试例子
line = "This is a Test String with Uppercase and Lowercase Letters."
uppercase, lowercase, whitespace = count_chars(line)
print(f"Uppercase letters: {uppercase}")
print(f"Lowercase letters: {lowercase}")
print(f"Whitespace characters: {whitespace}")