LearnPython/python_functional.py at master · psvm-enter/LearnPython · GitHub

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# _*_ coding: utf-8 _*_

from fn import _

from operator import add

from functools import partial, reduce

# 列表解析

a_list = [item**2 for item in range(5)]

print(a_list)

# 字典解析

a_dict = {"%d^2" % item: item**2 for item in range(5)}

print(a_dict)

# 生成器

a_generator = (item**2 for item in range(5))

print(a_generator)

print(next(a_generator))

# iter函数和next函数

a_list_generator = iter(a_list)

print(next(a_list_generator))

print(type(a_list), type(a_list_generator))

# lambda表达式

a_func = lambda x, y: x**y

print(a_func(2, 3))

# map函数

print(map(abs, range(-4, 5)))

print(list(map(abs, range(-4, 5))))

print(list(map(lambda x: x**2, range(5))))

print(list(map(lambda x, y: x**y, range(1, 5), range(1, 5))))

# reduce函数

print(reduce(lambda x, y: x+y, range(10)))

print(reduce(lambda x, y: x+y, range(10), 100))

print(reduce(lambda x, y: x+y, [[1, 2], [3, 4]], [0]))

# filter函数

print(filter(None, range(-4, 5)))

print(list(filter(None, range(-4, 5))))

print(list(filter(lambda x: x > 0, range(-4, 5))))

# all、any函数

print(all([0, 1, 2]))

print(any([0, 1, 2]))

# enumerate函数

for index, item in enumerate(range(5)):

print("%d: %d" % (index, item))

# zip函数

for a, b in zip([1, 2, 3], ["a", "b", "c"]):

print(a, b)

a_dict = dict(zip([1, 2, 3], ["a", "b", "c"]))

print(a_dict)

# partial函数

print(int("10010", base=2))

int_base_2 = partial(int, base=2)

print(int_base_2("10010"))

# operator.add函数

print(reduce(lambda x, y: x+y, range(10)))

print(reduce(add, range(10)))

# fn的使用

add_func_1 = (_ + 2)

print(add_func_1(1))

add_func_2 = (_ + _ * _)

print(add_func_2(1, 2, 3))

LearnPython/python_functional.py at master · psvm-enter/LearnPython · GitHub

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