Question

我在下面提供了CSV文件

CODE,PRODUCT
101,item_1
101,item_1
101,item_2
102,item_3
103,item_2
104,item_5

我需要转换成下面给出的字典

{101:{'item_1':2, 'item_2':1},
102:{'item_3':1},
103:{'item_2':1},
104:{'item_5':1}

我已使用CSV读取文件

import csv
def csv_reader(file_obj):
    reader = csv.reader(file_obj)
    for row in reader:
        print(" ".join(row))
if __name__ == "__main__":
    csv_path = 'g.csv'
    with open(csv_path, "r") as f_obj:
        csv_reader(f_obj)

如何转换为词典

{101:{'item_1':2, 'item_2':1},
    102:{'item_3':1},
    103:{'item_2':1},
    104:{'item_5':1}

Answer 1

由于每行都是从csv.reader返回的字符串列表，因此您应该尝试如下操作：

result_dict = {}
for row in reader:
    if row[0] in result_dict:
        if row[1] in result_dict[row[0]]:
            result_dict[row[0]][row[1]] += 1
        else:
            result_dict[row[0]][row[1]] = 1
    else:
        result_dict[row[0]] = {row[1]:1}

注意：这只是一个逻辑概述。请根据需要将其适当地放入代码中，并进行其他检查。

Answer 2

from collections import defaultdict, Counter

parsed = defaultdict(Counter)
reader = csv.reader(file_obj)
code_index = 0
product_index = 1
for row in reader:
    if row and len(row) >= 2:
        code = row[code_index]
        product = row[product_index]
        parsed[code][product] += 1

我认为这可以完成工作。

Answer 3

礼貌：@monkut

import csv
from collections import defaultdict, Counter
parsed = defaultdict(Counter)
file_obj = open(r'C:\Users\maws\Desktop\g.csv', 'r')
reader = csv.reader(file_obj)
code_index = 0
product_index = 1
next(file_obj)
for row in file_obj:
    row = row.split(',')
    #print (row)
    if row and len(row) >= 2:
        code = row[code_index]
        #print(code)
        product = row[product_index]
        parsed[code][product.strip()] += 1
parsed

如何使用Python从CSV创建嵌套字典

3 个答案: