如何更改列表中字典中特定键的值类型？

Question

list = [
   {'rank': '1', 'name': 'Gus’s World Famous Fried Chicken', 'stars': '4.0', 'numrevs': '549', 'price': '$$'}, 
   {'rank': '2', 'name': 'South City Kitchen - Midtown', 'stars': '4.5', 'numrevs': '1777', 'price': '$$'}
]

I need to update numrevs to int .

I have this so far, but I can't get it to work:

list = [dt.update({k : int(v)}) for dt in rankings for k['numrevs'], v in dt.items()]

Answer 1

Basically you can do it quite easy with that:

for d in mylist:
    d["numrevs"] = int(d["numrevs"])

As a remark: Don't name any variable list . list is a built-in function and to overwrite this function can only lead to problems therefore I renamed the list to mylist .

Answer 2

For each dict in your list, create a new dict, where the value for each key is the same as the current dict, except for the values that you want to replace with an int.

Here I am calling the current list list1 to avoid the confusion between the variable name and the built-in type name.

list2 = [ {k:(int(v) if k=='numrevs' else v) 
          for k,v in d.items()}
            for d in list1 ]