字典合并：
1 >>>a_dict = {'sky': 'asdf', 'liao': 'asdf'} 2 >>> a_dict 3 {'sky': 'asdf', 'liao': 'asdf'} 4 >>> b_dict = {'xiong': 'asdf', 'asky': 'asdf'} 5 >>> b_dict 6 {'xiong': 'asdf', 'asky': 'asdf'} 7 >>> c_dict = dict(a_dict, **b_dict) 8 >>> c_dict 9 {'sky': 'asdf', 'liao': 'asdf', 'xiong': 'asdf', 'asky': 'asdf'}
1 >>> a_dict = {'sky': 'asdf', 'liao': 'asdf'} 2 >>> a_dict 3 {'sky': 'asdf', 'liao': 'asdf'} 4 >>> b_dict = {'xiong': 'asdf', 'asky': 'asdf'} 5 >>> b_dict 6 {'xiong': 'asdf', 'asky': 'asdf'} 7 >>> c_dict = a_dict.copy() 8 >>> c_dict.update(b_dict) 9 >>> c_dict 10 {'sky': 'asdf', 'liao': 'asdf', 'xiong': 'asdf', 'asky': 'asdf'} 11 >>>