from functools import reduce

# list
example_list = list(range(0, 10))

# add multi elements to back of list
example_list.extend(list(range(10, 20)))
print(example_list)

# insert one element in target index
example_list.insert(0, -1)  # insert(index: int, element: obj)
print(example_list)

# clear the whole list
example_list.clear()
print(example_list)

# tuple
example_tuple = (1, 2, 3, 4, 5,)
single_tuple = 1,  # end with comma indicates it is a tuple

# operation is similar to list


# dict
example_dict = {'name': 'Zhou Kai', 'age': 45, 'University': 'ZJUT'}

# set
example_set = {1, 2, 2, 3, 4, 5}
print(example_set)
a = set('helloworld')
print(a)  # remove the rapid element and unsorted(maybe sorted is okay)

# lambda function: single line function
funtion = lambda x, y: abs(x) + y ** 3
print(funtion(1, 2))

# map() function  map(fun: function, Iterable) “map()方法会将 一个函数 映射到序列的每一个元素上，生成新序列，包含所有函数返回值。” from 知乎
a = list(range(0, 10))
print(list(map(str, a)))
print(list(map(lambda x: x ** 2, a)))

# function reduce() in functiontools
print(reduce(lambda x, y: x + y, a))  # return sum of list a

# function filter() "序列中的每个元素作为参数传递给函数进行判断，返回True或者False，最后将返回True的元素放到新列表中。" from CSDN
print(list(filter(lambda x: x % 2 == 0, a)))  # print odd number in list a

# function zip()  "zip() 函数用于将可迭代的对象作为参数，将对象中对应的元素打包成一个个元组，然后返回由这些元组组成的列表。" from RUNOOB.COM
print(list(zip(a, [1, 2, 3])))

# function enumerate()  "python中的enumerate()函数用于将一个可便利的数据对象（如列表、元组合字符串）组合为一个索引序列，同时列出数据和数据下标，一般用在for循环当中。" from CSDN
for i, v in enumerate(a):
    print(i, v)