表示python中的数据结构

Question

What's the best way to represent this data-structure in python:

[{'x': 230, 'y': 50}, {'x': 350, 'y': 50}, {'x': 410, 'y': 50}]

It's not json, it's something else, sorry for my stupidity, I'm searching various python tutorials, but can't figure out if it's some structure that can be easily loaded like numpy.load or json.loads, because when I try validating that structure as JSON, it says invalid json...

Answer 1

What you have there is a list of dictionaries.

myList = []

dict1 = {'x': 230, 'y': 50}
dict2 = {'x': 350, 'y': 50}
dict3 = {'x': 410, 'y': 50}

myList.append(dict1)
myList.append(dict2)
myList.append(dict3)

Answer 2

You have a list of three dictionaries (mappings of keys to values) and it works like this:

>>> dicts = [{'x': 230, 'y': 50}, {'x': 350, 'y': 50}, {'x': 410, 'y': 50}]
>>> dicts[0]
{'x': 230, 'y': 50}
>>> dicts[0]['x']
230
>>> dicts[2]['y']
50

Since all the dictionaries share the same keys ( 'x' and 'y' ) in your example you can interpret them as records .

A neat way to represent these records is with a pandas.DataFrame , which has a table-like printout.

>>> import pandas as pd
>>> pd.DataFrame(dicts)
     x   y
0  230  50
1  350  50
2  410  50

---

If you have a string

>>> s = "[{'x': 230, 'y': 50}, {'x': 350, 'y': 50}, {'x': 410, 'y': 50}]"

you can evaluate it safely with ast.literal_eval .

>>> from ast import literal_eval
>>> literal_eval(s)
[{'x': 230, 'y': 50}, {'x': 350, 'y': 50}, {'x': 410, 'y': 50}]