"""Compatibility functions.
"""
import time
from ._config import PYTHON_3_7
if PYTHON_3_7:
# Use the real perf_counter_ns
perf_counter_ns = time.perf_counter_ns
else:
def perf_counter_ns():
"""Compatibility version for pre Python 3.7."""
return int(time.perf_counter() * 1e9)