Question

Python 3 - 尝试使用Cisco路由器部署脚本。我试图在'router-input.txt'的输入值中替换多个文本值。不幸的是，我无法弄清楚如何在单个文件中替换多个值。在运行以下代码结束时，只输入最后一个值IOSOLD。

import fileinput

HOSTNAME = input("Hostname: ")
IOSCURRENT = input("Current IOS image: ")
IOSOLD = input("Old IOS image: ")


f = open("router-input.txt",'r')
filedata = f.read()
f.close()

newdata = filedata.replace("$HOSTNAME", HOSTNAME )
newdata = filedata.replace("$IOSCURRENT", IOSCURRENT )
newdata = filedata.replace("$IOSOLD", IOSOLD )


f = open('output.txt','w')
f.write(newdata)
f.close()

Answer 1

您继续修改filedata并将其保存在newdata中。每次，您都会覆盖以前的更改。尝试：

newdata = filedata.replace("$HOSTNAME", HOSTNAME )
newdata = newdata.replace("$IOSCURRENT", IOSCURRENT )
newdata = newdata.replace("$IOSOLD", IOSOLD )

Answer 2

如果文件太大，读取文件并将其保留在内存中效率非常低。我可能会做这样的事情

search_replace_dict = {
    "$HOSTNAME": 'HOSTNAME',
    "$IOSCURRENT": 'IOSCURRENT',
    "$IOSOLD": 'IOSOLD'}

with open("router-input.txt") as input_file, open('output.txt','w') as output_file:
    for each_line in input_file:
        for key, value in search_replace_dict.items():
            each_line = each_line.replace(key, value)
        output_file.write(each_line)

替换单个文件中的多个文本值

2 个答案: