Python：json 对 csv 的响应？答案

【问题标题】：Python: json response to csv?Python：json 对 csv 的响应？
【发布时间】：2019-11-19 13:44:17
【问题描述】：

我正在调用一个提供以下响应的 API (https://min-api.cryptocompare.com/data/histoday?fsym=BTC&tsym=USD&limit=10)：

{"Response":"Success","Type":100,"Aggregated":false,"Data":[{"time":1561852800,"close":10769.05,"high":12200.02,"low ":10677.83,"open":11884.1,"volumefrom":80893.36,"volumeto":917158052.37},{"time":1561939200,"close":10591.87,"high":11207,"low":10006.43,"open ":10769.05,"volumefrom":115739.97,"volumeto":1225129699.57},{"time":1562025600,"close":10844.13,"high":10927.6,"low":9678.1,"open":10591.87,"volumefrom ":120994.95,"volumeto":1239524970.43},{"time":1562112000,"close":11981.61,"high":12009.59,"low":10841.91,"open":10844.13,"volumefrom":115565.16,"volumeto ":1313585829.89},{"time":1562198400,"close":11156.52,"high":12055.11,"low":11067.68,"open":11981.61,"volumefrom":71141.03,"volumeto":831236841.56},{ "time":1562284800,"close":10993.25,"high":11435.38,"low":10787.94,"open":11156.52,"volumefrom":66066.75,"volumeto":734424868.07},{"time":1562371200, "收盘":11248.94,"高":11709.27,"低":10985.4,"开盘":10993.25,"volumefrom":48172.2,"volumeto":549769169.13},{"time":1562457600,"close":114 74.28,"high":11605.43,"low":11109.42,"open":11248.94,"volumefrom":36847.21,"volumeto":418161890.29},{"time":1562544000,"close":12296.16,"high": 12386.28,"low":11339.02,"open":11474.28,"volumefrom":63847.27,"volumeto":762033323.29},{"time":1562630400,"close":12537.38,"high":12808.06,"low": 12117.31,"open":12296.16,"volumefrom":79366.56,"volumeto":990863142.59},{"time":1562716800,"close":12855.54,"high":12855.54,"low":12537.38,"open": 12537.38,"volumefrom":0,"volumeto":0}],"TimeTo":1562716800,"TimeFrom":1561852800,"FirstValueInArray":true,"ConversionType":{"type":"direct","conversionSymbol" :""},"RateLimit":{},"HasWarning":false}

我需要将其转换为包含 time、close、high、low、open、volumefrom 和 volumeto 的列的 csv。这应该怎么做？我已经尝试了一些将 json 转换为 csv 的现有答案，但在这种情况下它们不起作用。

【问题讨论】：

一旦您使用例如json.loads(my_response)["Data"] 那么这个问题就变成了stackoverflow.com/questions/3086973/…、stackoverflow.com/questions/43138628/… 等的重复问题。

标签： python json pandas csv

【解决方案1】：

由于您没有提到文件的使用，我只是在没有 csv 库的情况下生成了逗号分隔值。但是，这也可以通过 it 完成。

import requests
import json

r = requests.get("https://min-api.cryptocompare.com/data/histoday?fsym=BTC&tsym=USD&limit=10")

# this is assuming the response has no errors and is status code 200
data = json.loads(r.text)

# in csv the headers are conventionally the first row
csv_data = "time, close, high, low, open"

for row in data["Data"]:

    # since the order is specific, select the values from the row in that order
    row_data = [row["time"], row["close"], row["high"], row["low"], row["open"]]

    # here I am using list comprehension to convert all the data from the row to a string
    # then I use the .join method to concatonate all these values as one comma seperated list
    csv_row = ", ".join([str(j) for j in row_data])

    csv_data += "\n" + csv_row

# here is your data
print(csv_data)

文档链接

requests - 一个常用的、友好的 Python 请求库包装器。
List Comprehension - 一种在 python 中生成列表的更紧凑的方式，并且效率也略高。

【讨论】：

【解决方案2】：

用 pandas 很容易做到：

import pandas as pd
import json

# Parse the json string to a python dictionary
data = json.loads(json_data)

# The desired data is in the `Data` field, use pandas to construct the data frame
df = pd.DataFrame(data["Data"])

# Save to a csv file
df.to_csv("result.csv")

【讨论】：

【解决方案3】：

给你！这应该适合你！随意提出任何其他问题，我已尝试将所有内容保持评论并保持合理整洁。 c:

#!/usr/bin/env python3
import json, csv

# Here is our input string/response. You can replace this!
responseString = '{"Response":"Success","Type":100,"Aggregated":false,"Data":[{"time":1561852800,"close":10769.05,"high":12200.02,"low":10677.83,"open":11884.1,"volumefrom":80893.36,"volumeto":917158052.37},{"time":1561939200,"close":10591.87,"high":11207,"low":10006.43,"open":10769.05,"volumefrom":115739.97,"volumeto":1225129699.57},{"time":1562025600,"close":10844.13,"high":10927.6,"low":9678.1,"open":10591.87,"volumefrom":120994.95,"volumeto":1239524970.43},{"time":1562112000,"close":11981.61,"high":12009.59,"low":10841.91,"open":10844.13,"volumefrom":115565.16,"volumeto":1313585829.89},{"time":1562198400,"close":11156.52,"high":12055.11,"low":11067.68,"open":11981.61,"volumefrom":71141.03,"volumeto":831236841.56},{"time":1562284800,"close":10993.25,"high":11435.38,"low":10787.94,"open":11156.52,"volumefrom":66066.75,"volumeto":734424868.07},{"time":1562371200,"close":11248.94,"high":11709.27,"low":10985.4,"open":10993.25,"volumefrom":48172.2,"volumeto":549769169.13},{"time":1562457600,"close":11474.28,"high":11605.43,"low":11109.42,"open":11248.94,"volumefrom":36847.21,"volumeto":418161890.29},{"time":1562544000,"close":12296.16,"high":12386.28,"low":11339.02,"open":11474.28,"volumefrom":63847.27,"volumeto":762033323.29},{"time":1562630400,"close":12537.38,"high":12808.06,"low":12117.31,"open":12296.16,"volumefrom":79366.56,"volumeto":990863142.59},{"time":1562716800,"close":12855.54,"high":12855.54,"low":12537.38,"open":12537.38,"volumefrom":0,"volumeto":0}],"TimeTo":1562716800,"TimeFrom":1561852800,"FirstValueInArray":true,"ConversionType":{"type":"direct","conversionSymbol":""},"RateLimit":{},"HasWarning":false}'

# Turn the response into JSON and only grab the 'Data' list.
responseString = json.loads(responseString)['Data']

# Open us a new file!
with open('output.csv', 'w') as output_csv_file:
    # Create us a new csv_object using the keys of the data as fieldnames.
    csv_object = csv.DictWriter(output_csv_file, fieldnames=responseString[0].keys())

    # For each row of data in the JSON, print it and write it to the CSV.
    for row in responseString:
        print(row)
        csv_object.writerow(row)

# Automatically close CSV file/object and print "Done!"
print("Done!")

【讨论】：