我有一个CSV文件如下所示。我需要使用python将CSV转换为字典字典。
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输出应如下所示
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
请让我知道如何做到这一点。提前致谢
答案 0 :(得分:2)
您正在寻找嵌套字典。在Python中实现perl的自动修复功能(详细描述见here)。这是一个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 = csv.reader(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()
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
答案 1 :(得分:0)
import numpy as np
col1,col2,col3 = np.loadtxt('test2.csv',delimiter=',',skiprows=1,unpack=True,dtype=int)
dataset = {}
for a,b,c in zip(col1,col2,col3):
if str(a) in dataset:
dataset[str(a)][str(b)]=str(c)
else:
dataset[str(a)]={str(b):str(c)}
print(dataset)
这应该做。上面的示例文件看起来像tsv(制表符分隔值)。如果是这样,请在我的示例中删除分隔符标志。
答案 2 :(得分:0)
import csv
dataset = dict()
with open("file_name", "rb") as csv_file:
data = csv.DictReader(csv_file)
for row in data:
old_data = dataset.get(row["userId"], None)
if old_data is None:
dataset["userId"] = {row["movieId"]: row["rating"] }
else:
old_data[row["movieId"]] = row["rating"]
dataset[row["userId"]] = old_data