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  1. from collections import defaultdict
  2. from functools import partial
  3. class_dict= defaultdict(partial(defaultdict,list))
  4.  
  5. sections = ['A', 'B', 'A', 'A', 'B']
  6. students = ['Jack', 'Jim', 'Jack', 'Leena', 'Jim']
  7. subjects = ['Maths', 'Biology', 'Chemistry', 'English', 'Physics']
  8.  
  9. for (section, student, subject) in zip(sections, students, subjects):
  10.     class_dict[section][student].append(subject)
  11.  
  12. print class_dict
Success #stdin #stdout 0.03s 6428KB
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defaultdict(<functools.partial object at 0x839efa4>, {'A': defaultdict(<type 'list'>, {'Leena': ['English'], 'Jack': ['Maths', 'Chemistry']}), 'B': defaultdict(<type 'list'>, {'Jim': ['Biology', 'Physics']})})
https://ideone.com/4xpAI
language:
Python (cpython 2.7.16)
created:
12 years ago
visibility:
public

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