在python词典中用'替换'\\ n'

Question

I'm reading from dataset with json objects, in dataset some of values has abcd\\nabdc format. I used following code:

for line in open("c:\\dataset","r+").readlines():
       d= json.loads(line)
       str1 = d['strkey1']
       str1.replace('\n' , '')

but it fails to replace.

Answer 1

d['strkey1'] = d['strkey1'].replace('\n', '')

Strings are immutable, so string methods return new strings, not modifying the original.

Also:

for line in open("c:\\dataset","r+"):

Will suffice, you don't need to .readlines() the whole file into memory before going through each line. But that still isn't enough, you need to remember to close your files, a with statement will handle that for you:

with open("c:\\dataset","r+") as f:
    for line in f:
        # do stuff

Answer 2

Just change your code to:

for line in open("c:\\dataset","r+").readlines():
       dict = json.loads(line)
       dict['strkey1'] = dict['strkey1'].replace('\n','')

This works and your's doesn't as strings are immutable (they can't be changed), so string methods return a new string, (which here you need to store)