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def list_demo():
print('创建')
list_0 = []
list_1 = [0, 1, 2, 3, 4]
list_2 = [x for x in range(10)]
print('list_0 = {}'.format(list_0))
print('list_1 = {}'.format(list_1))
print('list_2 = {}'.format(list_2))
print('按下标索引')
print('list_1[0] = {}'.format(list_1[0]))
print('按下标、切片修改')
list_1[0] = 999
list_2[0:3] = [6, 66, 666]
print('list_1 = {}'.format(list_1))
print('list_2 = {}'.format(list_2))
print('增加元素、拓展列表')
list_1.append(0)
list_2 += [0]
print('list_1 = {}'.format(list_1))
print('list_2 = {}'.format(list_2))
print('按值删除、按下标删除')
list_1.remove(999)
del list_2[len(list_2)-1]
print('list_1 = {}'.format(list_1))
print('list_2 = {}'.format(list_2))
print('遍历并按条件删除')
for item in list_1[:]:
if item == 4:
del item
for i in range(len(list_1)-1, -1, -1):
if list_2[i] == 4:
del list_1[i]
print('list_1 = {}'.format(list_1))
print('list_2 = {}'.format(list_2))
print('排序')
new_list = sorted(list_1, key=lambda x: -x)
print(new_list)
def dict_demo():
print('创建')
dict_0 = {}
dict_1 = {0: 'zero', 1: 'one', 2: 'two', 3: 'three', 4: 'four'}
dict_2 = {x: x**2 for x in range(10)}
print('list_0 = {}'.format(dict_0))
print('list_1 = {}'.format(dict_1))
print('list_2 = {}'.format(dict_2))
print('按下标索引')
print('dict_1[0] = {}'.format(dict_1[0]))
print('dict_1[999] = {}'.format(dict_1.get(999, 'default')))
print('按下标、切片修改')
dict_1[0] = 999
print('dict_1 = {}'.format(dict_1))
print('增加元素、拓展字典')
dict_1[-1] = 'minus one'
dict_2.update(dict_1)
print('dict_1 = {}'.format(dict_1))
print('dict_2 = {}'.format(dict_2))
print('按下标删除')
del dict_2[-1]
print('dict_2 = {}'.format(dict_2))
print('遍历并按条件删除')
for k in list(dict_2.keys()):
if k == 2 or dict_2[k] == 'three':
del dict_2[k]
print('dict_2 = {}'.format(dict_2))
print('按value排序')
dict_2[-1] = 999
new_list = sorted(dict_2.items(), key=lambda item: (str(item[1]), -item[0]))
print(new_list)
def set_demo():
print('创建')
set_0 = set()
set_1 = {0, 1, 2, 3, 4, 4, 4}
set_2 = {x for x in range(10)}
print('list_0 = {}'.format(set_0))
print('list_1 = {}'.format(set_1))
print('list_2 = {}'.format(set_2))
print('增加元素、拓展字典')
set_1.add(999)
set_1.update(set_2)
print('set_1 = {}'.format(set_1))
print('按元素删除')
set_1.remove(999)
print('set_1 = {}'.format(set_1))
if __name__ == '__main__':
list_demo()
print(''.center(100, '-'))
dict_demo()
print(''.center(100, '-'))
set_demo()
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