JSON：

Question

我正在学习Python，遇到了使用python读取json的问题，并且遇到了以下问题，不知道如何处理这种情况。非常感谢您的帮助。

我正在使用python 3.6，JSON文件格式如下所示

JSON：

{
    "Meta Data": {
        "1. Information": "Intraday (5min) open, high, low, close prices and volume",
        "2. Symbol": "MSFT",
        "3. Last Refreshed": "2019-07-03 13:05:00",
        "4. Interval": "5min",
        "5. Output Size": "Compact",
        "6. Time Zone": "US/Eastern"
    },
    "Time Series (5min)": {
        "2019-07-03 13:05:00": {
            "1. open": "137.4500",
            "2. high": "137.5000",
            "3. low": "137.2064",
            "4. close": "137.5000",
            "5. volume": "0"
        },
        "2019-07-03 13:00:00": {
            "1. open": "137.4800",
            "2. high": "137.6000",
            "3. low": "137.2400",
            "4. close": "137.4500",
            "5. volume": "759357"
        },
        "2019-07-03 12:55:00": {
            "1. open": "137.4300",
            "2. high": "137.5100",
            "3. low": "137.4015",
            "4. close": "137.4720",
            "5. volume": "371471"
        },
        "2019-07-03 12:50:00": {
            "1. open": "137.3750",
            "2. high": "137.4500",
            "3. low": "137.2800",
            "4. close": "137.4333",
            "5. volume": "222396"
        },
        "2019-07-03 12:45:00": {
            "1. open": "137.4100",
            "2. high": "137.4700",
            "3. low": "137.3200",
            "4. close": "137.3727",
            "5. volume": "248270"
        },
        "2019-07-03 12:40:00": {
            "1. open": "137.3000",
            "2. high": "137.4128",
            "3. low": "137.2900",
            "4. close": "137.4100",
            "5. volume": "177767"
        },
        "2019-07-03 12:35:00": {
            "1. open": "137.3200",
            "2. high": "137.3700",
            "3. low": "137.2600",
            "4. close": "137.3000",
            "5. volume": "194017"
        },
        "2019-07-03 12:30:00": {
            "1. open": "137.3797",
            "2. high": "137.4250",
            "3. low": "137.3100",
            "4. close": "137.3100",
            "5. volume": "148587"
        },
        "2019-07-03 12:25:00": {
            "1. open": "137.4400",
            "2. high": "137.4500",
            "3. low": "137.3600",
            "4. close": "137.3750",
            "5. volume": "163235"
        },
        "2019-07-03 12:20:00": {
            "1. open": "137.2300",
            "2. high": "137.4650",
            "3. low": "137.1900",
            "4. close": "137.4400",
            "5. volume": "241906"
        },
}
}

我尝试过的代码：

Python

import json
with open("d:/Python Projects/myjason3.json") as f:
    j1 = json.load(f)

    for data in j1['Time Series (5min)']:

        print([data]['1. open'])

我想在每个时间序列值（例如“ 2019-07-03 13:05:00”）下打印键“ 1.open”的值。我收到的错误是：

 print([data]['1. open'])
TypeError: list indices must be integers or slices, not str

Answer 1

您没有正确引用数据字典。您应该能够像这样遍历@ComponentScan键值：

'Time Series (5min)'

Answer 2

第一个错误来自import cv2 import pytesseract pytesseract.pytesseract.tesseract_cmd = 'C:\\Program Files\\Tesseract-OCR\\tesseract.exe' im_gray = cv2.imread('test/tlqkf10.png', cv2.IMREAD_GRAYSCALE) (thresh, im_bw) = cv2.threshold(im_gray, 127, 255, cv2.THRESH_TRUNC | cv2.THRESH_OTSU) chapNum4 = pytesseract.image_to_string(im_bw, lang='eng', config="-psm 8 -oem 3") print(chapNum4)：data的括号。

print(data['1. open'])创建仅包含一个元素[data]的列表，而您想直接访问data字典。

此外，您将在字典上进行迭代，该字典将生成键而不是值；尝试：data

Answer 3

for data in j1['Time Series (5min)']:将遍历字典的键（日期），而不遍历实际数据。

[data]['1. open']转换为（即在第一次迭代中）为["2019-07-03 13:05:00", ]['1. open']，因此您尝试通过键（["2019-07-03 13:05:00", ]）访问字符串列表（'1. open'）。

要遍历字典的键和值，Python的方法是使用dict.items() api：

import json
with open("d:/Python Projects/myjason3.json") as f:
    j1 = json.load(f)
    for datetime_key, data in j1['Time Series (5min)'].items():
        print(data['1. open'])

使用不同的重复键读取JSON并打印输出

JSON：

Python

3 个答案: