为什么将`frozen = true`添加到dataclass都会使其变慢？
如上所述。特别是，我认为它是慢的两倍。我会认为这会使事情更快。
from timeit import timeit
setup = """
from dataclasses import dataclass
@dataclass(frozen=True) # repeat with False
class A:
a: int = 1
b: int = 1
"""
code = """
obj = A(3, 2)
"""
print(f"{timeit(code, setup, number=1000_000)=}")
As above. In particular, I see that it is twice as slow. I would have thought it makes things faster.
from timeit import timeit
setup = """
from dataclasses import dataclass
@dataclass(frozen=True) # repeat with False
class A:
a: int = 1
b: int = 1
"""
code = """
obj = A(3, 2)
"""
print(f"{timeit(code, setup, number=1000_000)=}")
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摘自 frolozen Instances ：
From the documentation of frozen instances: