Question

我是python的新手，请帮助我将数组输出到.txt文件。我的二维数组输出很大。

这是我的代码：

num_of_mangoes[]
for i in range(shops):
  num_of_mangoes.append([])
   for j in range(fruits):
     num_of_mangoes[i].append(j)

return num_of_mangoes

其他信息：

商店数量= 200000
水果数= 500

Answer 1

假设实际代码为：

num_of_mangoes = []
for i in range(shops):
    num_of_mangoes.append([])
    for j in range(fruits):
        num_of_mangoes[i].append(j)

我建议使用json module将其导出到文件中

import json


with open("num_of_mangoes.txt", "w") as file:
    json.dump(file, num_of_mangoes)

如果您想从文件中读取列表，可以执行以下操作：

with open("num_of_mangoes.txt", "r") as file:
    num_of_mangoes = json.load(file)

Answer 2

尝试使用此代替：

# we'll use this module later on
import json

# define the number of shops and fruits    
shops, fruits = 200000, 500

# create the "num_of_mangoes" list using a list comprehension
num_of_mangoes = [[j for j in range(fruits)] for i in range(shops)]

# open the file (create if not exists), write to it, then close it
f = open("num_of_mangoes.txt", "w")
# NOTE: the "separators" and "indent" arguments are used to minify the json
f.write(json.dumps(num_of_mangoes, separators = (',', ':'), indent = 0))
f.close()

这是同一代码的单线版本：

import json; with open("num_of_mangoes.txt", "w") as f: f.write(json.dumps([[j for j in range(500)] for i in range(200000)], separators = (',', ':'), indent = 0))

缩小：

import json;with open("num_of_mangoes.txt","w") as f:f.write(json.dumps([[j for j in range(500)] for i in range(200000)],separators=(',',':'),indent=0))

警告：您的JSON文件将变得（非常可笑）大，请不要使用像Atom这样的文本编辑器打开它，它可能会冻结您的计算机，请使用{{1} }，cat或head命令。

警告：：鉴于您拥有tail（二十万家）商店，此列表将需要一段时间才能创建，因此建议您降低该数字以进行测试。

祝你好运。

如何在Python中将字符串数组输出到文件

2 个答案: