文件突然写入 1 行数据而不是整个请求

Question

我正在使用 IBAPI 收集历史股票报价，目前，我正在使用此代码来实现：

from ibapi.client import EClient
from ibapi.wrapper import EWrapper
from ibapi.contract import Contract


def print_to_file(*args):
    with open('text2.txt', 'w') as fh:
        fh.write(' '.join(map(str,args)))
        fh.write('\n')
        fh.close()
print = print_to_file


class TestApp(EWrapper, EClient):
    def __init__(self):
        EClient.__init__(self, self)


    Layout = "{!s:1} {!s:2} {!s:3} {!s:4} {!s:5} {!s:6} {!s:7} {!s:8} {!s:8} '\n'"
    print(Layout.format("Ticker;", "Date;", "None;", "Time;", "Open;", "High;", "Low;", "Close;", "Volume", '\n'))


    def historicalData(self, reqId, bar):
        print("AAPL", ";", bar.date.replace(' ', '; '), ";", bar.open, ";", bar.high, ";", bar.low, ";", bar.close, ";", bar.volume)


def main():
    app = TestApp()

    app.connect("127.0.0.1", 7497, 0)

    contract = Contract ()
    contract.symbol = "AAPL"
    contract.secType = "STK"
    contract.exchange = "SMART"
    contract.currency = "USD"
    contract.primaryExchange = "NASDAQ"

    app.reqHistoricalData(0, contract, "", "1 D", "1 min", "TRADES", 0, 1, False, [])

    app.run()

if __name__ == "__main__":
    main()

这段代码起初运行良好，但突然只返回 1 行文本，而不是请求附带的所有行。

这里有人可以帮我找出问题所在吗？

应该写入文本文件的代码是：

def print_to_file(*args):
    with open('text2.txt', 'w') as fh:
        fh.write(' '.join(map(str,args)))
        fh.write('\n')
        fh.close()
print = print_to_file

如果我让代码写入终端而不是文件，我会得到整个请求，而不仅仅是 1 行。

谢谢！

Answer 1

文件以 'w' 模式打开，因此函数会在每次打开时截断文件。应该使用模式 'a'。

https://docs.python.org/3/library/functions.html#open

'w' open for writing, truncating the file first

'a' open for writing, appending to the end of the file if it exists

文件突然写入 1 行数据而不是整个请求

File suddenly writes 1 row of data instead of whole entire request

python

pycharm

python-3.x

interactive-brokers