I have a JSON output, where I want to create a csv file, that contains two columns. The first column should contain the userId and the second column should contain the value of videoSeries. The output looks like this:
{
"start": 1490383076,
"stop": 1492975076,
"events": [
{
"time": 1491294219,
"customParameters": [
{
"group": "channelId",
"item": "dr3"
},
{
"group": "videoGenre",
"item": "unknown"
},
{
"group": "videoSeries",
"item": "min-mor-er-pink"
},
{
"group": "videoSlug",
"item": "min-mor-er-pink"
}
],
"userId": "cx:hr1y0kcbhhr61qj7kspglu767:344xy3wb5bz16"
}
],
}
My csv should look like this:
--------------------------------------------------------------
User ID videoSeries
--------------------------------------------------------------
cx:hr1y0kcbhhr61qj7kspglu767:344xy3wb5bz16 min-mor-er-pink
--------------------------------------------------------------
I have tried using ijson and pandas to get the desired output, but I am unable to get values from two different arrays into a single csv
import ijson
import pandas as pd
with open('MY JSON FILE', 'r') as f:
objects = ijson.items(f, 'events.item')
pandaReadable = list(objects)
df = pd.DataFrame(pandaReadable, columns=['userId', 'customParameters'])
df.to_csv('C:/Users/.../Desktop/output.csv', columns=['userId', 'customParameters'], index=False)
Try this approach:
d
is a dictionary built from your JSON:
In [150]: d
Out[150]:
{'events': [{'customParameters': [{'group': 'channelId', 'item': 'dr3'},
{'group': 'videoGenre', 'item': 'unknown'},
{'group': 'videoSeries', 'item': 'min-mor-er-pink'},
{'group': 'videoSlug', 'item': 'min-mor-er-pink'}],
'time': 1491294219,
'userId': 'cx:hr1y0kcbhhr61qj7kspglu767:344xy3wb5bz16'}],
'start': 1490383076,
'stop': 1492975076}
Solution:
In [153]: pd.io.json.json_normalize(d['events'], 'customParameters', ['userId']) \
...: .query("group in ['videoSeries']")[['userId','item']]
...:
Out[153]:
userId item
2 cx:hr1y0kcbhhr61qj7kspglu767:344xy3wb5bz16 min-mor-er-pink
if you need to have videoSeries
as a column name:
In [154]: pd.io.json.json_normalize(d['events'], 'customParameters', ['userId']) \
...: .query("group in ['videoSeries']")[['userId','item']] \
...: .rename(columns={'item':'videoSeries'})
...:
Out[154]:
userId videoSeries
2 cx:hr1y0kcbhhr61qj7kspglu767:344xy3wb5bz16 min-mor-er-pink