生成将两个字符串连接起来的多行Python函数
user
```python
def concatenate_strings(str1, str2):
    """
    This function concatenates two strings.

    Parameters:
    str1 (str): The first string.
    str2 (str): The second string.

    Returns:
    str: The concatenated string.
    """
    concatenated_string = str1 + str2
    return concatenated_string
```
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