试图从 Python 中的字典列表中提取特定数据。 （使用罗宾股票）

Question

So I'm using the robin-stocks api and I'm trying to pull specific data from a provided function.

The output when I print:

positions = r.crypto.get_crypto_positions()

is:

[{'account_id': 'removed', 'cost_bases': [{'currency_id': 'removed', 'direct_cost_basis': '0.110000000000000000', 'direct_quantity': '0.000011050000000000', 'id': 'removed', 'intraday_quantity': '0.000000000000000000', 'intraday_cost_basis': '0.000000000000000000', 'marked_cost_basis': '0.000000000000000000', 'marked_quantity': '0.000000000000000000'}], 'created_at': '2020-05-07T20:44:23.510080-04:00', 'currency': {'brand_color': 'EA963D', 'code': 'BTC', 'id': 'removed', 'increment': '0.000000010000000000', 'name': 'Bitcoin', 'type': 'cryptocurrency'}, 'id': 'removed', 'quantity': '0.000011050000000000', 'quantity_available': '0.000011050000000000', 'quantity_held_for_buy': '0.000000000000000000', 'quantity_held_for_sell': '0.000000000000000000', 'updated_at': '2020-05-07T23:40:34.381524-04:00'}]

This is the documentation on their website regarding this:

robin_stocks.crypto.get_crypto_positions(info=None)[source]

Returns crypto positions for the account.

Parameters: info (Optional[str]) – Will filter the results to get a specific value. Returns: Returns a list of dictionaries of key/value pairs for each option. If info parameter is provided, a list of strings is returned where the strings are the value of the key that matches info.

My goal here is to get the 'direct_cost_basis' . How can I achieve this? I'm fairly decent at python however this is just going over my head.

Answer 1

positions is a list of dicts. You can access the first element in the list with

positions[0]

The direct_cost_basis appears to be in a dict in a list which is keyed by cost_bases , which is in the first element of positions . Therefore:

positions[0]["cost_bases"][0]["direct_cost_basis"]

will yield what you want.

As part of your debugging process, while printing something in Python it can be useful to also print the "type" of the object via type(positions) which would return list . You can use this all the way down to determine how to access these data types. You can also call the function dir(positions) on any Python object which will tell you that object's attributes and methods.