Python将字典写入文件

Question

I have a original config file which I found a very nice way to read. Like this:

myDict = {}
cfg = file(configFile, 'r').readlines()
myDict = eval('\n'.join(cfg))

This gets my file's contents in to myDict very nicely. But what is a simple looking way to make changes to its contents and create/write to a new modified file? thanks

Answer 1

You could try this (overlooking the security hole of eval):

myDict = {}
with open(configFile, 'r+') as file:
    cfg = file.readlines()
    myDict = eval('\n'.join(dgf))
    myDict['new key'] = 'new value'

    file.seek(0)
    file.write(str(myDict)) #format this if you want, str() is raw
    file.truncate()

The above should open the file, evaluate the contents as a dict (as per your code), add a new value (just modifying the dictionary), and then overwrite the original file.