extract_list_to_dict

extract_list_to_dict.py

# goal : extract a list of string based on first char.
# use case : parsing argument given to a cli command.
from itertools import groupby
arg_tags = ['!dog', 'dog', '!Monty']            # input values
{{1:'exclude',0:'include'}[k]:                  # key value from dict
 list(g)                                        # values from groupby
 for k,g in groupby(
                    sorted(
                            arg_tags,           # argument to sort
                            key=lambda i : i[0] # based on first char
                          ) ,
                    lambda i : i[0] == '!'      # groupby function function
                    )
}

# Out: {'exclude': ['!dog', '!Monty'], 'include': ['dog']}