75 lines
1.7 KiB
Python
75 lines
1.7 KiB
Python
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# _*_ coding: utf-8 _*_
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from fn import _
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from operator import add
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from functools import partial, reduce
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# 列表解析
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a_list = [item**2 for item in range(5)]
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print(a_list)
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# 字典解析
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a_dict = {"%d^2" % item: item**2 for item in range(5)}
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print(a_dict)
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# 生成器
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a_generator = (item**2 for item in range(5))
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print(a_generator)
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print(next(a_generator))
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print(next(a_generator))
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# iter函数和next函数
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a_list_generator = iter(a_list)
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print(next(a_list_generator))
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print(next(a_list_generator))
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print(type(a_list), type(a_list_generator))
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# lambda表达式
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a_func = lambda x, y: x**y
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print(a_func(2, 3))
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# map函数
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print(map(abs, range(-4, 5)))
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print(list(map(abs, range(-4, 5))))
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print(list(map(lambda x: x**2, range(5))))
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print(list(map(lambda x, y: x**y, range(1, 5), range(1, 5))))
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# reduce函数
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print(reduce(lambda x, y: x+y, range(10)))
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print(reduce(lambda x, y: x+y, range(10), 100))
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print(reduce(lambda x, y: x+y, [[1, 2], [3, 4]], [0]))
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# filter函数
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print(filter(None, range(-4, 5)))
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print(list(filter(None, range(-4, 5))))
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print(list(filter(lambda x: x > 0, range(-4, 5))))
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# all、any函数
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print(all([0, 1, 2]))
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print(any([0, 1, 2]))
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# enumerate函数
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for index, item in enumerate(range(5)):
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print("%d: %d" % (index, item))
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# zip函数
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for a, b in zip([1, 2, 3], ["a", "b", "c"]):
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print(a, b)
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a_dict = dict(zip([1, 2, 3], ["a", "b", "c"]))
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print(a_dict)
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# partial函数
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print(int("10010", base=2))
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int_base_2 = partial(int, base=2)
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print(int_base_2("10010"))
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# operator.add函数
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print(reduce(lambda x, y: x+y, range(10)))
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print(reduce(add, range(10)))
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# fn的使用
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add_func_1 = (_ + 2)
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print(add_func_1(1))
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add_func_2 = (_ + _ * _)
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print(add_func_2(1, 2, 3))
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