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How to empty a list?

... the old label with a new empty list: del lst[:] Here's an example: lst1 = [1, 2, 3] lst2 = lst1 del lst1[:] print(lst2) For the sake of completeness, the slice assignment has the same effect: lst[:] = [] It can also be used to shrink a part of the list while replacing a part at the same ti...
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Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?

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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...
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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...
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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...
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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...
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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...
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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...
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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...
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Deep Learning(深度学习)学习笔记整理系列之(二) - 大数据 & AI - 清泛...

...理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者:Zouxyversion 1.0 2013-04-08原文网址:h...Deep Learning(深度学习)学习笔记整理系列 zouxy09@qq.com http://blog.csdn.net/zouxy09 作者:Zouxy version 1.0 2013-04-08 原文网址:http://blog.csdn.net/zouxy09/arti...