```python3
from contextlib import contextmanager
from django.db.models.signals import *


@contextmanager
def disable_signals(sender, receiver, *signals):
    if not signals:
        signals = [pre_init, post_init, pre_save, post_save, pre_delete, post_delete]
    disconnected_signals = []
    for signal in signals:
        if signal.disconnect(receiver, sender):
            disconnected_signals.append(signal)
    try:
        yield
    finally:
        for signal in disconnected_signals:
            signal.connect(receiver, sender)


# Example usage:
# with disable_signals(user.__class__, some_func, post_save):
#   user.save()  # will not call any signals
```