sample code：

#!/usr/bin/python3
# -*- coding: UTF-8 -*-
import json
import time


def loads_json_from_file(content):
    if not content:
        return None
    return json.loads(content)


def generate():
    members = []
    for i in range(200):
        with open("./2.json", 'r') as fb:
            member = loads_json_from_file(fb.read())
        members.append(member)
    del members
    import gc; gc.collect()


if __name__ == '__main__':
    generate()
    while 1:
        time.sleep(10)

Use python -m memray run json_rep.py to generate flamefile:

Bug report

Theoretically, the del variables should not occupy any memory. However, the printed flame chart shows that the memory applied for by json.loads is not released, which seems to cause memory leakage.

Your environment

env:
└─$ uname -a
Linux DESKTOP-IEKI9L0 5.15.90.1-microsoft-standard-WSL2 #1 SMP Fri Jan 27 02:56:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
└─$ python --version
Python 3.10.6

• CPython versions tested on: Python 3.10.6
• Operating system and architecture: Linux DESKTOP-IEKI9L0 5.15.90.1-microsoft-standard-WSL2 Support "bpo-" in Misc/NEWS #1 SMP Fri Jan 27 02:56:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux