python print %-20s

回答: 在Python中，使用print函数进行字符串格式化输出时，可以使用%-20s来实现左对齐并占位20位的效果。\[3\]这里的%s表示字符串格式化，而%后面的-表示左对齐，20表示占位符的宽度为20位。所以，当我们使用print("%-20s" % str)时，会将字符串str左对齐并占位20位输出。
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