| 12345678 |
- # 测试用例
- assert ''.join([]) == ''
- assert ','.join(['a']) == 'a'
- assert ','.join(['a', 'b']) == 'a,b'
- assert ''.join(['a', 'b', 'c']) == 'abc'
- assert '-'.join(['a', 'b', 'c']) == 'a-b-c'
- assert ' '.join(['hello', 'world']) == 'hello world'
- print("PASS")
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