python - 从少于 4 位的列表中提取数字，并在每个数字的开头和结尾附加一个字符串

问题描述

我有一个包含多个数字的文件。

如果数字长度小于 4 位，我们需要将其提取并附加 0 到开头，+ 一个后缀，然后附加到主列表。

前任

DF = [ 1, 23, 333, 4444]

应该

DF = [0001.hk, 0023.hk, 0333.hk, 4444.hk]

下面的代码有效，并帮助我完成上述任务。

Master_List = [Here is where all tickers should be store for some further processing]

def prework1():
    file = 'Path/to/document'
    tickers = []
    read = pd.read_csv(file, names =['IB_Symbol', 'Description', 'Symbol', 
    'Currency'])
    tickers = read['Symbol'].tolist()

    ticker_list = []

    for ticker in tickers:
        if len(ticker) == 1:
            ticker_list.append(ticker)

    ticker_list1 = []

    for ticker in ticker_list:
        string = '000'
        string1 = '.hk'
        tickers1 = [string + ticker + string1]
        ticker_list1.append(tickers1)

    ticker_list2 = []

    for sublist in ticker_list1:
        for item in sublist:
            ticker_list2.append(item)

    return ticker_list2



def prework2():
    file = 'Path/to/document'
    tickers = []
    read = pd.read_csv(file, names =['IB_Symbol', 'Description', 'Symbol', 'Currency'])
    tickers = read['Symbol'].tolist()

ticker_list = []

    for ticker in tickers:
        if len(ticker) == 2:
            ticker_list.append(ticker)

    ticker_list1 = []

    for ticker in ticker_list:
        string = '00'
        string1 = '.hk'
        tickers1 = [string + ticker + string1]
        ticker_list1.append(tickers1)

    ticker_list3 = []

    for sublist in ticker_list1:
        for item in sublist:
            ticker_list3.append(item)

    return ticker_list3


def prework3():
    file = 'Path/to/document'
    tickers = []
    read = pd.read_csv(file, names =['IB_Symbol', 'Description', 'Symbol', 
    'Currency'])
    tickers = read['Symbol'].tolist()

    ticker_list = []

    for ticker in tickers:
        if len(ticker) == 3:
            ticker_list.append(ticker)

    ticker_list1 = []

    for ticker in ticker_list:
        string = '0'
        string1 = '.hk'
        tickers1 = [string + ticker + string1]
        ticker_list1.append(tickers1)

    ticker_list4 = []

    for sublist in ticker_list1:
        for item in sublist:
            ticker_list4.append(item)

    return ticker_list4



test1 = prework1()
test2 = prework2()
test3 = prework3()

print(test1)
print(test2)
print(test3)

上述方法存在几个问题。

使用上面的代码，它会给我 3 个列表，但结果应该只有 1 个列表，所以我可以做一些进一步的处理/任务。

另外，我觉得它看起来很奇怪和重复。它会做预期的事情，但是有没有办法让它变得更好一点？

感谢所有帮助！

标签： pythonpython-3.x

python - 从少于 4 位的列表中提取数字，并在每个数字的开头和结尾附加一个字符串

问题描述

解决方案

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