MappingProxyType performance

bench.py

import timeit
import types

def create_benchmark(test_dict):
    def benchmark():
        for key in range(100):
            if key in test_dict:
                value = test_dict[key]
    return benchmark

# Benchmark normal dict
normal_dict = {key: str(key) for key in range(100)}
normal_benchmark = create_benchmark(normal_dict)
time_normal_dict = timeit.timeit(normal_benchmark, number=100000)
print(f"{time_normal_dict:.6e} s\tdict")

# Benchmark dict wrapped in MappingProxyType
proxy_dict = types.MappingProxyType({key: str(key) for key in range(100)})
proxy_benchmark = create_benchmark(proxy_dict)
time_proxy_dict = timeit.timeit(proxy_benchmark, number=100000)
print(f"{time_proxy_dict:.6e} s\tMappingProxyType")

# 2.607128e-01 s	dict
# 2.819931e-01 s	MappingProxyType