Nested Dictionary Size and List

Question

I have a dictionary with the following format:

Demo code:

>>> import pprint
>>> pprint.pprint(data)
{'lookup': {'F01': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F02': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F03': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F04': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F05': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F06': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F07': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F08': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F09': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F10': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F11': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }',
            'F12': '\n.custom1 {\n    background-color: #f5e9dc;\n    padding: 10px;\n    border-radius: 10px;\n    font-family: sans-serif;\n    font-size: 0.9em;\n    margin-top: 1em;\n    }\n.custom2 .style8-rw {\n    font-family: sans-serif;\n    font-weight: bold;\n    color: #F57215;\n    }'},
 'sequence': ['F01',
              'F02',
              'F03',
              'F04',
              'F05',
              'F06',
              'F07',
              'F08',
              'F09',
              'F10',
              'F11',
              'F12']}
>>> import sys
>>> sys.getsizeof(data)
136
>>> sys.getsizeof(data["sequence"])
80
>>> sys.getsizeof(data["lookup"])
520
>>> 

I can’t get how the nested dictionary is stored in memory, because the if size datais 136 bytes and the size data["sequence"]is 80 bytes and the size data["lookup"]is 520 bytes.

Also, when I type casting variable data from dictionaryto string, then the size of the string variable 3587 bytes.

Demo code:

>>> data_str = str(data)
>>> sys.getsizeof(data_str)
3587

Can someone explain to me why?

Answer 1

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