如何在Python文件中实现模板变量的查找与替换？

需要将模板文件中的_tNumb_、_sName_、_sNumb_、_ip1_、_ip2_替换为用户输入的值，但现有代码仅重复模板文本，未完成替换。

模板文件内容：

ZOYX:_sName_:IUA:S:BCSU,_sNumb_:AFAST;

ZOYP:IUA:_sName_:"_ip1_",,49155:"_ip2_",30,,,49155;

ZDWP:_sName_:BCSU,_sNumb_:0,3:_sName_;

ZOYS:IUA:_sName_:ACT;

ZERC:BTS=58,TRX=_tNumb_::FREQ=567,TSC=0,:DNAME=_sName_:CH0=TCHD,CH1=TCHD,CH2=TCHD,CH3=TCHD,CH4=TCHD,CH5=TCHD,CH6=TCHD,CH7=TCHD:;

ZERM:BTS=58,TRX=_tNumb_:LEV=-91;

ZERM:BTS=58,TRX=_tNumb_:PREF=N;

ZERS:BTS=58,TRX=_tNumb_:U;

现有Python代码：

repeat="y"
while repeat == "y":

    keys=['_ip1_', '_ip2_', '_sName_', '_sNumb_', '_tNumb_']
    print(keys) 
    #print(keys[2])
    print("+++++++++++++++++++++++++++++1")

    values=[]
    #ip1, ip2, sName, sNumb, tNumb = input("Enter the IP address1: "), input("Enter the IP address2: "), input("Enter the station name: "), input("Enter the station number: "), input("Enter the transmitter number: ")
    ip1, ip2, sName, sNumb, tNumb = 1111, 2222, 3333, 4444, 5555
    
    values.append(ip1)
    values.append(ip2)
    values.append(sName)
    values.append(sNumb)
    values.append(tNumb)
    print(values)
    #print(values[2])
    print("+++++++++++++++++++++++++++++2")

    dictionary={}
    for i in range(len(keys)):
        dictionary[keys[i]] = values[i]
        search_text = dictionary[keys[i]]
        replace_text = keys[i]
        print(search_text)
        print(replace_text)
        print("+++++++++++++++++++++++++++++3")


    with open(r'template.txt', 'r') as oFile:
        rFile = oFile.read()
    #print(rFile)
    with open(r'output.txt', 'a') as wFile:
        wFile.write('\n')
        wFile.write('\n')
        wFile.write('\n')
        wFile.write(rFile)




    repeat = input("Do you want to continue? (y/n): ")
    if repeat == "n":
        break
    while (repeat!="y" and repeat!="n"):
        repeat = input("Please enter the correct answer (y/n): ")

期望输出：

ZOYX:3333:IUA:S:BCSU,4444:AFAST;

ZOYP:IUA:3333:"1111",,49155:"2222",30,,,49155;

ZDWP:3333:BCSU,4444:0,3:3333;

ZOYS:IUA:3333:ACT;

ZERC:BTS=58,TRX=5555::FREQ=567,TSC=0,:DNAME=3333:CH0=TCHD,CH1=TCHD,CH2=TCHD,CH3=TCHD,CH4=TCHD,CH5=TCHD,CH6=TCHD,CH7=TCHD:;

ZERM:BTS=58,TRX=5555:LEV=-91;

ZERM:BTS=58,TRX=5555:PREF=N;

ZERS:BTS=58,TRX=5555:U;

你的代码核心问题是没有对读取的模板文本执行替换操作，只是直接将原模板写入输出文件。需要在读取模板后，遍历占位符与输入值的映射关系，完成文本替换后再写入文件。

修改后的代码：

repeat = "y"
while repeat == "y":
    # 获取用户输入
    ip1 = input("Enter the IP address1: ")
    ip2 = input("Enter the IP address2: ")
    sName = input("Enter the station name: ")
    sNumb = input("Enter the station number: ")
    tNumb = input("Enter the transmitter number: ")
    
    # 构建占位符与输入值的映射字典
    replace_map = {
        '_ip1_': ip1,
        '_ip2_': ip2,
        '_sName_': sName,
        '_sNumb_': sNumb,
        '_tNumb_': tNumb
    }

    # 读取模板文件
    with open('template.txt', 'r') as oFile:
        template_content = oFile.read()
    
    # 批量替换所有占位符
    modified_content = template_content
    for placeholder, value in replace_map.items():
        modified_content = modified_content.replace(placeholder, value)
    
    # 将替换后的内容写入输出文件
    with open('output.txt', 'a') as wFile:
        wFile.write('\n\n\n')
        wFile.write(modified_content)

    # 询问是否继续执行
    repeat = input("Do you want to continue? (y/n): ")
    while repeat not in ["y", "n"]:
        repeat = input("Please enter the correct answer (y/n): ")

关键修改说明： #

1. 实现替换逻辑：读取模板后，通过str.replace()方法遍历映射字典，逐个替换所有占位符。
2. 简化字典构建：直接用键值对形式定义映射关系，比循环构建更简洁易维护。
3. 恢复用户输入：将测试用的固定值改回input()，让程序实际接收用户输入的内容。
4. 精简冗余代码：移除不必要的打印语句和中间变量，让逻辑更清晰。

内容的提问来源于stack exchange，提问作者David138