add dictionarie in json file

[bowlofred]

Please show all the code as well.

The post you are replying to has the initial open specified as:

with open('testjson_dict.json') as ifh:

which uses the default open mode of "read". Your error message suggests that you are using a mode "w" (or "a"). You've opened the file for writing only and have asked the json method to read from it.