57 lines
1.3 KiB
Python
57 lines
1.3 KiB
Python
#!/usr/bin/env python3
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# -*- coding: UTF-8 -*-
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class FunctionalList:
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''' 实现了内置类型list的功能,并丰富了一些其他方法: head, tail, init, last, drop, take'''
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def __init__(self, values=None):
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if values is None:
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self.values = []
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else:
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self.values = values
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def __len__(self):
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return len(self.values)
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def __getitem__(self, key):
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return self.values[key]
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def __setitem__(self, key, value):
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self.values[key] = value
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def __delitem__(self, key):
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del self.values[key]
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def __iter__(self):
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return iter(self.values)
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def __reversed__(self):
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return FunctionalList(reversed(self.values))
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def append(self, value):
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self.values.append(value)
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def head(self):
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# 获取第一个元素
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return self.values[0]
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def tail(self):
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# 获取第一个元素之后的所有元素
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return self.values[1:]
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def init(self):
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# 获取最后一个元素之前的所有元素
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return self.values[:-1]
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def last(self):
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# 获取最后一个元素
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return self.values[-1]
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def drop(self, n):
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# 获取所有元素，除了前N个
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return self.values[n:]
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def take(self, n):
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# 获取前N个元素
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return self.values[:n]
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