I am trying to use the following dictionary (' ContinentDict ') to bin countries by continent .
Thus, I would like to bin keys by value .
ContinentDict = {'China':'Asia',
'United States':'North America',
'Japan':'Asia',
'United Kingdom':'Europe',
'Russian Federation':'Europe',
'Canada':'North America',
'Germany':'Europe',
'India':'Asia',
'France':'Europe',
'South Korea':'Asia',
'Italy':'Europe',
'Spain':'Europe',
'Iran':'Asia',
'Australia':'Australia',
'Brazil':'South America'}
When I try option 1:
v = {}
for key, value in sorted(d.items()):
v.setdefault(value, []).append(key)
I get the error:
Traceback (most recent call last):
File "<input>", line 2, in <module>
TypeError:'dict' object is not callable
When I try option 2:
from collections import defaultdict
dictionary = defaultdict(list)
for key, value in ContinentDict:
dictionary[value].append(key)
I get the error:
Traceback (most recent call last):
File "<input>", line 1, in <module>
TypeError: first argument must be callable or None
Could anybody give me a helping hand?
For option 2, I think you missed .items()
. This worked for me:
ContinentDict = {'China':'Asia',
'United States':'North America',
'Japan':'Asia',
'United Kingdom':'Europe',
'Russian Federation':'Europe',
'Canada':'North America',
'Germany':'Europe',
'India':'Asia',
'France':'Europe',
'South Korea':'Asia',
'Italy':'Europe',
'Spain':'Europe',
'Iran':'Asia',
'Australia':'Australia',
'Brazil':'South America'}
dictionary = defaultdict(list)
for key, value in ContinentDict.items():
dictionary[value].append(key)
print(dictionary)
Output:
defaultdict(<class 'list'>, {'Asia': ['China', 'Japan', 'India', 'South Korea', 'Iran'], 'North America': ['United States', 'Canada'], 'Europe': ['United Kingdom', 'Russian Federation', 'Germany', 'France', 'Italy', 'Spain'], 'Australia': ['Australia'], 'South America': ['Brazil']})
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.