How to use 'python sum dictionary values by key' in Python
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29 def count_value(lst, key): 30 d = {} 31 for obj in lst: 32 val = obj[key] 33 if val in d: 34 d[val] = d[val] + 1 35 else: 36 d[val] = 1 37 return d.iteritems()
600 def sum_dict(self, dictionary): 601 '''This method returns the sum of all values within a 602 nested dictionary that can contain float numbers 603 and/or other dictionaries containing the same type 604 of elements. It works in a recursive way. 605 606 Parameters 607 ---------- 608 dictionary: dict or float 609 dictionary containing other dictionaries and/or 610 float numbers. If it's a float it will return 611 its value directly 612 613 Returns 614 ------- 615 val: float 616 value of the sum of all values within the 617 nested dictionary 618 619 ''' 620 621 # Initialize the sum 622 val=0. 623 # If dictionary is a float we have arrived to an 624 # end point and we want to return its value 625 if isinstance(dictionary, float): 626 627 return dictionary 628 629 # If dictionary is still a dictionary we should 630 # keep searching for an end point with a float 631 elif isinstance(dictionary, dict): 632 for k in dictionary.keys(): 633 # Sum the values within this dictionary 634 val += self.sum_dict(dictionary=dictionary[k]) 635 636 return val