python将csv转字典，如何在python中将csv转换成字典？
I have a CSV file shown below.I need to convert CSV to dictionary of dictionaries using python.
userId movieId rating
1 16 4
1 24 1.5
2 32 4
2 47 4
2 50 4
3 110 4
3 150 3
3 161 4
3 165 3
The output should be like shown below
dataset={'1':{'16':4,'24':1.5},
python新手代码userid'2':{'32':4,'47':4,'50':4},
'3':{'110':4,'150':3,'161':4,'165':3}}
Please let me know how to do this. Thanks in advance
解决⽅案
You are looking for nested dictionaries. Implement the perl's autovivification feature in Python (the detailed description is given here). Here is a MWE.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import csv
class AutoVivification(dict):
"""Implementation of perl's autovivification feature."""
def __getitem__(self, item):
try:
return dict.__getitem__(self, item)
except KeyError:
value = self[item] = type(self)()
return value
def main():
d = AutoVivification()
filename = 'test.csv'
with open(filename, 'r') as f:
reader = ader(f, delimiter=',')
next(reader) # skip the header
for row in reader:
d[row[0]][row[1]] = row[2]
print(d)
#{'1': {'24': '1.5', '16': '4'}, '3': {'150': '3', '110': '4', '165': '3', '161': '4'}, '2': {'32': '4', '50': '4', '47': '4'}} if __name__ == '__main__':
main()
The content of test.csv,
userId,movieId,rating
1,16,4
1,24,1.5
2,32,4
2,47,4
2,50,4
3,110,4
3,150,3
3,161,4
3,165,3

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