How to use variable in a double underscore method in python / django

I am using the django framework to create a website where i have to do some filtering on my database. I have created a function where you can filter upon any field in the database. I need to use the __gte method to find all records which is greater than or equal to a particular field. I pass the desired field as attribute inside my function.

How can i find all records greater than or equal to any field that i pass into my function?

def top_percentiles(attribute, web_name, player_id):
    #filters to find desired player e.g Ronaldo
    searched_player = PlayerInfo.objects.filter(web_name=web_name, id=player_id)
    #gets the value of the desired attribute e.g price = 10.0
    players_attribute = getattr(searched_player[0], attribute)
    #filters for all the players with a greater value e.g 10.5, 11.0
    players_with_greater_attribute = PlayerInfo.objects.filter(attribute.__gte=players_attribute)

#filter for Ronaldos price, goals, assists
top_percentiles(price, "Ronaldo", 123)
top_percentiles(goals, "Ronaldo", 123)
top_percentiles(assists, "Ronaldo", 123)

Error message:

SyntaxError: expression cannot contain assignment, perhaps you meant "=="?

Models.py

class PlayerInfo(models.Model):
    price = models.FloatField()
    assists = models.IntegerField() 
    bonus = models.IntegerField() 
    bps = models.IntegerField() 
    chance_of_playing_next_round = models.IntegerField()
    chance_of_playing_this_round = models.IntegerField() 
    ...
    ..