Please, help me to understand why setting key parameter of SortedDict in the following code:
from sortedcontainers import SortedDict
SortedDict({1:2, 0:1}) # works
SortedDict({1:2, 0:1}, key=lambda x: x) # TypeError
SortedDict({'a':2, 0:1}, key=lambda x: 1 if isinstance(x,str) else x) # TypeError
gives the following error:
TypeError: '<' not supported between instances of 'int' and 'str'
How can one fix the examples? Thank you very much for your help!
From the documentation: http://www.grantjenks.com/docs/sortedcontainers/sorteddict.html
The key-function argument must be provided as a positional argument and must come before all other arguments.
Your code should thus read:
from sortedcontainers import SortedDict
SortedDict({1:2, 0:1})
SortedDict(lambda x: x, {1:2, 0:1})
SortedDict(lambda x: 1 if isinstance(x,str) else x, {'a':2, 0:1})
The sortedcontainer documentation says that you're calling the SortedDict constructor wrong:
http://www.grantjenks.com/docs/sortedcontainers/sorteddict.html
The key-function argument must be provided as a positional argument and must come before all other arguments.