option_list is a list of dictionaries with strings.
This code works as long as the option_list list is not too large.
option_list = sorted(option_list, key = lambda option: option['expiration_date'])
option_list = sorted(option_list, key = lambda option: option['strike_price'], reverse=True)
It's sorting the option data by expiration date and strike price.
However, when the option_list list gets to an arbitrary-to-me length, it throws this error:
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-237-7fd70ddaa35a> in <module>()
3 # option_list = sorted(option_list, key = lambda option: (option['expiration_date'], option['strike_price']))
4
----> 5 option_list = sorted(option_list, key = lambda option: option['expiration_date'])
6 option_list = sorted(option_list, key = lambda option: option['strike_price'], reverse=True)
7
<ipython-input-237-7fd70ddaa35a> in <lambda>(i)
3 # option_list = sorted(option_list, key = lambda option: (option['expiration_date'], option['strike_price']))
4
----> 5 option_list = sorted(option_list, key = lambda option: option['expiration_date'])
6 option_list = sorted(option_list, key = lambda option: option['strike_price'], reverse=True)
7
TypeError: 'NoneType' object is not subscriptable
However, truncating the option_list list to an arbitrary number works again:
option_list = sorted(option_list[:-5000], key = lambda option: option['expiration_date'])
I've tried -1000, but that is not low enough.
Why does this happen, and how can I fix it so I don't have to cut off data?
Seems like your problem is missing data. Since the error is referencing to NoneTypes. Try filtering the missing data out first:
no_missing_options = [o for o in option_list if o]
option_list = sorted(no_missing_options , key=lambda x: x['expiration_date'])