矩陣到字典的轉換

Question

我有一個帶有2列的CSV文件。我想在字典中存儲第1列作爲鍵和第2列作爲值，並將其存儲在輸出文件中。

import math 
import numpy 
import csv 
from decimal import * 
#opening Result file with 
open('output.csv','rb') as file: 
    contents = csv.reader(file) 
#storing content of Result file in matrix 
matrix = list() 
    for row in contents: 
    matrix.append(row) 
lookup = dict(matrix) # Storing 2 columns of matrix as key:value in dictionary 
# open a new csv file for writing. 
csv_out = open('MPA.csv', 'wb') 
mywriter = csv.writer(csv_out)`` 
csv_out.close() 

我寫了這個代碼不工作，產生所需的輸出。

Answer 1

import csv 
import json 

with open('test.csv') as f: 
    with open('MPC.json', 'w') as g: 
    json.dump(dict([(v[0], v[1]) for v in csv.reader(f)]), g) 

Answer 2

的事情是要創建一個csv.writer但不寫任何東西到file.That是空文件的原因。關閉文件之前添加下面一行：

csv_out = open('MPA.csv', 'wb') 
mywriter.writerows(lookup.items()) # Add this line. 
csv_out.close() 

如果您想通過標籤，而不是逗號分隔的數據替換此：

mywriter = csv.writer(csv_out) 

由：

mywriter = csv.writer(csv_out, delimiter='\t')