Python - Getting string from list inside dict

Question

I know this is something purely simple, but I can't wrap my head around it. I want to access the song "Sunrise" in the following dict/list. What's the proper way to do this with Python?

{"Player": 
    {"Playlist": 
        [
            {"Song" : "Foo", "Album" : "Bar"}, 
            {"Song" : "Sunrise", "Album", : "Random"}
        ]
    }
}

Answer 1

d = {"Player": 
    {"Playlist": 
        [
            {"Song" : "Foo", "Album" : "Bar"}, 
            {"Song" : "Sunrise", "Album", "Random"}
        ]
    }
}

for song in d['Player']['PlayList']:
    print song

Prints:

{'Album': 'Bar', 'Song': 'Food'}
{'Album': 'Random', 'Song': 'Sunrise'}

To access an element of a list in a dictionary, in this instance the value Sunrise inside of Song :

for song in d['Player']['Playlist']:
    if song['Song'] is 'Sunrise':
        #do thing with song here
        print song

prints:

{'Album': 'Random', 'Song': 'Sunrise'}

In Python, a Dictionary can contain lots of different types of values for a given key. Breaking down your dictionary, this is what everything actually is:

{"Player":  
    {"Playlist": 
        [
            {"Song" : "Foo", "Album" : "Bar"}, 
            {"Song" : "Sunrise", "Album", "Random"}
        ]
    }
}

d['Player']:

Result : {'Playlist': [{'Album': 'Bar', 'Song': 'Food'}, {'Album': 'Random', 'Song': 'Sunrise'}]}

The Key is a string, the value is a dictionary of playlists.

---

d['Player']['Playlist']:

Result : {'Playlist': [{'Album': 'Bar', 'Song': 'Food'}, {'Album': 'Random', 'Song': 'Sunrise'}]}

the key is Playlist , the value is a list of dict ionaries.

---

d['Player']['Playlist'][0]

Result : {'Album': 'Bar', 'Song': 'Food'}

This is a list accessor, it access the first element in the list (in this case, the dict that holds the Album and the Song )

---

d['Player']['Playlist'][0]['Album']:

Result : 'Bar'

Accesses the value of the dictionary with the key Album inside the first element of the list inside the playlist.

---

Or, to spell it out if you're a perl guy, you have a dictionary of Player s that has a dictionary of Playlists with a list of dictionaries of songs (song data) inside of it.

Answer 2

如果d是您的字典，则

 d['Player']['Playlist'][1]['Song']