[1.1. PYTHON迭代](1.1.PYTHON%E8%BF%AD%E4%BB%A3.md) [1.2. 函数式编程](1.2.%E5%87%BD%E6%95%B0%E5%BC%8F%E7%BC%96%E7%A8%8B.md) [1.3. Collections类](1.3.Collections%E7%B1%BB.md)