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列表生成器：[ ] + 一行流

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樊睡懒觉

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  1. 初始：list(range(1, 11))
  2. 运算：[x * x for x in range(1, 11)]
  3. 条件：[x * x for x in range(1, 11) if x % 2 == 0]
  4. 双重：[m + n for m in 'ABC' for n in 'XYZ']
  5. 多变：[k + '=' + v for k, v in d.items()]
  6. 新知：import os
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