[Python] "Expected type 'SupportsWrite[str]', got 'TextIO' instead"

import json

class Account:
"""Creates a new account"""
def __init__(self, name: str, account_no: int, pin: int, balance: float):
self.name = name.capitalize()
self.account_no = account_no
self.pin = pin
self.balance = balance
self._update_ledger()

def _update_ledger(self):
# Gets the current ledgers
with open("ledgers.json", "r") as fp:
customers = json.load(fp)
# Updates the ledgers
with open("ledgers.json", "w") as fp:
customers[self.name] = self.__dict__
json.dump(customers, fp, indent=2)


My code runs perfectly fine, but my code inspector in pycharm warns me for a potential error saying "Expected type 'SupportsWrite[str]', got 'TextIO' instead" on the variable fp on the last line.

I just that yellow underline for potential error under fp to disappear.

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