我正在尝试将每个字典包含3个项目的字典写到一个json文件中,最终我将将其与熊猫一起使用。
每本字典看起来像这样:
xyz_dictionary = {'x': 1, 'y': 2, 'z':3}
我正在执行以下操作以将其制成字符串,然后将其添加到.json
文件中:
with open('jsonfile.json', 'a') as json_file:
json_file.write(json.dumps(xyz_dictionary, indent=4))
我处于不断创建新的“ xyz”字典的情况,因此我必须将每个字典都转换为json格式,然后将其附加到json文件中。问题是我完成后,我的json文件最终看起来像这样:
{
"x": -0.03564453125,
"y": -0.00830078125,
"z": 1.0244140625
}{
"x": -0.0361328125,
"y": -0.0087890625,
"z": 1.0244140625
}{
"x": -0.0390625,
"y": -0.0087890625,
"z": 1.025390625
}{
"x": -0.03662109375,
"y": -0.0087890625,
"z": 1.0263671875
}
,其中的json对象不是逗号分隔的。当我尝试用熊猫加载它时,出现trailing Data
ValueError
您可以看到它不是一个大数组,其中包含一堆json对象,它只是一堆非逗号分隔的json对象
总而言之,问题是“我如何创建逗号分隔的json对象,并将它们写入到.json
文件中,这些文件是所有文件的汇编?”
谢谢你
答案 0 :(得分:1)
编辑:我建议您创建一个json对象数组
import json
{ 'xyz_data':
[{
"x": -0.03564453125,
"y": -0.00830078125,
"z": 1.0244140625
},
{
"x": -0.03564453125,
"y": -0.00830078125,
"z": 1.0244140625
}, ...
]}
使用append添加到dic
outfile = "Pathforfile.csv"
list = []
xyz_dictionary = {'x': 1, 'y': 2, 'z':3}
list.append(xyz_dictionary)
.... #append all xyz values
data = {'xyz' : list}
json_data = json.dumps(data) # save the data in Json format
json.dump(data, outfile) # or save it directly to a file
要读取文件
json_data=open(file_directory).read()
data = json.loads(json_data)
答案 1 :(得分:0)
我建议您阅读文件,附加新数据,然后再写回。然后可以将其正确加载到大熊猫中。
import json, os
import pandas as pd
filepath = 'jsonfile.json'
class get_file:
def __init__(self, path):
self.path = path or filename
def __enter__(self):
#see if file exists and create if not
data = {'xyz_data':[]}
if not os.path.isfile(path):
file = open(path, 'rw')
json.dump(data, file)
else:
#This is just to ensure that the file is valid json
#if not it replaces the old datafile with a blank json file
#This is hacky and you will lose all old data!
file = open(path, 'rw') as file:
try:
data = json.load(file)
except ValueError:
json.dump(data, file)
#this line can be deleted, just shows the data after opening
print(data)
self.file = file
return file
def __exit__(self):
self.file.close()
def append_data(data, path: str=None):
"""Appends data to the file at the given path, defaults to filepath"""
path = path or filepath
with get_data(path) as json_file:
d = json.load(json_file)
d = d['xyz_data']
if isinstance(d, list):
d.extend(data)
elif isinstance(d, dict):
d.append(data)
else:
raise TypeError("Must be list or dict")
json.dump(d, json_file)
def get_dataframe(path):
path = path or filepath
with get_data(path) as json_file:
data = json.load(json_file)
df = pd.DataFrame(data['xyz_data'])
return df
这未经测试,因为我不在我的工作站上,但希望它能使您理解这个概念。 让我知道是否有任何错误!
欢呼