[Python] dictionary 사용법

# dictionary 

my_dict = {"one":1,"two":2,"three":3}

list(my_dict)
=> ['one', 'two', 'three']

list(my_dict.values())
=> [1, 2, 3]

my_dict["one"]=10
=> {'one': 10, 'two': 2, 'three': 3}

del my_dict["two"]
=> {'one': 10, 'three': 3}

"one" in my_dict
=> True

"four" not in my_dict
=> True