从 python 导出和导入数组

Question

我目前有下面的数组，我正在尝试将其导出到 .txt 文件，然后将其导入回 python，我将如何去做。

data = [
    {"score": "10", "grade": "E", "music": "song5", "maxcombo": "1", "perfect": "20", "great": "1", "good": "20", "miss": "1"},
    {"score": "20", "grade": "D", "music": "song4", "maxcombo": "2", "perfect": "20", "great": "2", "good": "20", "miss": "2"},
    {"score": "30", "grade": "C", "music": "song3", "maxcombo": "3", "perfect": "20", "great": "3", "good": "20", "miss": "3"},
    {"score": "40", "grade": "B", "music": "song2", "maxcombo": "4", "perfect": "20", "great": "4", "good": "20", "miss": "4"},
    {"score": "50", "grade": "A", "music": "song1", "maxcombo": "5", "perfect": "20", "great": "5", "good": "20", "miss": "5"},
]

Answer 1

有很多方法可以保存数据，“正确”的方法实际上取决于上下文、用例等。但是，您的数据格式（字典列表）和您提到的文本文件强烈建议使用 @ 987654321@ 格式。 Python 使用 standardlib's csv module 让事情变得简单。

Answer 2

看起来您需要一个简单的保存到文本文件的案例。 json 可能很容易开始。

试试这个： 1.将内容作为json保存到文本文件中 2. 您可以再次加载数据并转换为json，这将像dict对象一样工作。

file_path = '/tmp/dict_test.txt'
import json
data = [
    {"score": "10", "grade": "E", "music": "song5", "maxcombo": "1", "perfect": "20", "great": "1", "good": "20", "miss": "1"},
    {"score": "20", "grade": "D", "music": "song4", "maxcombo": "2", "perfect": "20", "great": "2", "good": "20", "miss": "2"},
    {"score": "30", "grade": "C", "music": "song3", "maxcombo": "3", "perfect": "20", "great": "3", "good": "20", "miss": "3"},
    {"score": "40", "grade": "B", "music": "song2", "maxcombo": "4", "perfect": "20", "great": "4", "good": "20", "miss": "4"},
    {"score": "50", "grade": "A", "music": "song1", "maxcombo": "5", "perfect": "20", "great": "5", "good": "20", "miss": "5"},
]

# dump the dict contents using json 
with open(file_path, 'w') as outfile:
    json.dump(data, outfile, indent=4, separators=(',', ':'))

# Let's read the data back again from the file
file_text = ''
with open(file_path, 'rt') as file_placeholder:
    lines = file_placeholder.readlines()
    file_text = ''.join(lines)  # This provides the whole file data as string

print('file_text = {}'.format(file_text))
# Load as json
json_text = json.loads(file_text)
print('json = {}'.format(json_text))
print('file_text type = {}; json_text type = {}'.format(type(file_text), type(json_text)))

你会得到以下结果：

file_text = [
    {
        "good":"20",
        "grade":"E",
        "great":"1",
.............
    }
]
json = [{'good': '20', 'grade': 'E', 'great': '1', 'music': 'song5', 'score': '10', 'miss': '1', 'maxcombo': ................ 'perfect': '20'}]
file_text type = <class 'str'>; json_text type = <class 'list'>

Answer 3

这会将您的数据写入输出文件并帮助您开始。那么你所要做的就是阅读它，这很容易。

import json

data = [
{"score": "10", "grade": "E", "music": "song5", "maxcombo": "1", "perfect": "20", "great": "1", "good": "20", "miss": "1"},
{"score": "20", "grade": "D", "music": "song4", "maxcombo": "2", "perfect": "20", "great": "2", "good": "20", "miss": "2"},
{"score": "30", "grade": "C", "music": "song3", "maxcombo": "3", "perfect": "20", "great": "3", "good": "20", "miss": "3"},
{"score": "40", "grade": "B", "music": "song2", "maxcombo": "4", "perfect": "20", "great": "4", "good": "20", "miss": "4"},
{"score": "50", "grade": "A", "music": "song1", "maxcombo": "5", "perfect": 
"20", "great": "5", "good": "20", "miss": "5"},
]

outputfile = 'output.json'# create this file
with open(outputfile, 'wb') as outfile:
    json.dump(row, outfile)

Answer 4

您可以pickle 文件中的数据，这会将data 列表序列化为 Python 对象：

pickle.dump(data, open('data.pkl', 'w')) # dump the contents of data into a file