在python中，如何在api端点中的{之前添加$符号

Question

I need to add a $ symbol before the { on each line. how can I do it in python,

Problem: Using python I am reading all the API endpoint from the JSON file before I pass those API endpoints, I need to append a $ symbol just before to the open parenthesis {

Below is the code reads the API endpoint name from JSON file and prints.

import json
with open("example.json", "r") as reads: # Reading all the API endpoints  from json file.
    data = json.load(reads)
    print(data['paths'].items())
    for parameters, values in data['paths'].items():
        print(parameters)

From the above code, I need to go further to achieve adding a $ symbol next to { before printing it.

Below list i get by reading the json file using python:

/API/{id}/one
/{two}/one/three
/three/four/{five}

Expected is:

/API/${id}/one
/${two}/one/three
/three/four/${five}

Answer 1

You Can use re library.

for parameters, values in data['paths'].items():
     print(re.sub('{', '${', parameters))

For more info on re , Go through the doc. https://docs.python.org/3/library/re.html , It's a very helpful module.

Answer 2

You could use .replace() .

>>> obj="""
... /API/{id}/one
... /{two}/one/three
... /three/four/{five}
... """
>>> newobj = obj.replace('{','${')
>>> print(newobj)

/API/${id}/one
/${two}/one/three
/three/four/${five}