如何用列表中的值替换 url 中的值并使用 FOR 循环遍历它们

Question

我试图弄清楚如何用列表中的其他交换替换我的代码中字符串中的“BATS”，并循环遍历它们以在一个 python 脚本中获取股票数据，而不是硬编码和创建多个单独的文件。 此外，希望根据正在解析的任何交换，使用相同的逻辑替换生成的本地 .csv 文件 (BATS_2021-01-19.csv) 的值。这是我的代码。

import pandas as pd
import time
import os
import datetime


datetime = datetime.datetime.today().strftime('%Y-%m-%d')
exchanges = ["BATS","US","SG","LSE","V","TSE"]

df = pd.read_csv('https://eodhistoricaldata.com/api/eod-bulk-last-day/BATS?api_token=5f1343ba20.00275101&date=' + str(datetime))


Ticker = df['Code']
Date = df['Date']
Open = df['Open'].round(2)
High = df['High'].round(2)
Low = df['Low'].round(2)
Close = df['Adjusted_close'].round(2)
Volume = df['Volume']

total_df = pd.concat([Ticker, Date, Open, High, Low, Close, Volume],
                 axis=1, keys=['Ticker','Date','Open','High','Low','Close','Volume'])

filename = "BATS_"+(datetime)+".csv"

path = 'H:/EOD_DATA_RECENT/DOWNLOADS/'
full_path = os.path.join(path, filename)
total_df.to_csv(full_path, index=False)

print(total_df.head(5))

Answer 1

您使用字符串格式来指定 url 中的数据，同时遍历您的交换。

在您的字符串引号之前放置一个f 将允许您通过用{} 包围变量名称将变量直接输入到字符串中

for ex in exchanges:
    print(f'https://eodhistoricaldata.com/api/eod-bulk-last-day/{ex}?api_token=5f1343ba20.00275101&date={str(datetime)}')

    
https://eodhistoricaldata.com/api/eod-bulk-last-day/BATS?api_token=5f1343ba20.00275101&date=2021-01-20
https://eodhistoricaldata.com/api/eod-bulk-last-day/US?api_token=5f1343ba20.00275101&date=2021-01-20
https://eodhistoricaldata.com/api/eod-bulk-last-day/SG?api_token=5f1343ba20.00275101&date=2021-01-20
https://eodhistoricaldata.com/api/eod-bulk-last-day/LSE?api_token=5f1343ba20.00275101&date=2021-01-20
https://eodhistoricaldata.com/api/eod-bulk-last-day/V?api_token=5f1343ba20.00275101&date=2021-01-20
https://eodhistoricaldata.com/api/eod-bulk-last-day/TSE?api_token=5f1343ba20.00275101&date=2021-01-20

您还应该重命名您的 datetime 变量，因为在声明该变量后您将无法再次使用 datetime。

datetime.datetime.now()
Traceback (most recent call last):
  File "<pyshell#18>", line 1, in <module>
    datetime.datetime.now()
AttributeError: 'str' object has no attribute 'datetime'