Python 将临时文件加载为模块

发布于 2025-01-12 03:08:51 字数 948 浏览 0 评论 0原文

我似乎无法使用 importlib 加载包含内容的 tempfile。如果我将内容保存在 python 文件（扩展名为 .py）下，然后提供该文件路径，则效果很好。

有没有办法让 importlib 与临时文件一起工作？

作为参考，请参阅下面的示例代码：

import importlib
import importlib.util
import tempfile


with tempfile.NamedTemporaryFile(mode="w", delete=False) as tf:
    tf.write("""
class Test:
    def __init__(self):
        pass
""")
    tf.seek(0)

    file_path = tf.name

    spec = importlib.util.spec_from_file_location("script", file_path)
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)

    t = getattr(module, "Test", None)
    print(t)

我收到错误：

Traceback (most recent call last):
  File "test.py", line 17, in <module>
    module = importlib.util.module_from_spec(spec)
  File "<frozen importlib._bootstrap>", line 580, in module_from_spec
AttributeError: 'NoneType' object has no attribute 'loader'

原文

I can't seem to load a tempfile with contents using importlib. It works fine if I have the content saved under a python file (with .py extension), then provide that file path.

Is there a way to make the importlib work with a tempfile?

For reference, see the sample code below:

import importlib
import importlib.util
import tempfile


with tempfile.NamedTemporaryFile(mode="w", delete=False) as tf:
    tf.write("""
class Test:
    def __init__(self):
        pass
""")
    tf.seek(0)

    file_path = tf.name

    spec = importlib.util.spec_from_file_location("script", file_path)
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)

    t = getattr(module, "Test", None)
    print(t)

I get an error:

Traceback (most recent call last):
  File "test.py", line 17, in <module>
    module = importlib.util.module_from_spec(spec)
  File "<frozen importlib._bootstrap>", line 580, in module_from_spec
AttributeError: 'NoneType' object has no attribute 'loader'

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夜巴黎 2025-01-19 03:08:51

注意：spec = importlib.util.spec_from_file_location("script", file_path)
规格为无

import importlib
import importlib.util
import tempfile

with tempfile.NamedTemporaryFile(mode="w", delete=False) as tf:
    tf.write("""
class Test:
    def __init__(self):
        pass
""")
    tf.seek(0)

    file_path = tf.name

    spec = importlib.util.spec_from_file_location("script", file_path)
    print(f'{spec=}')
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)

    t = getattr(module, "Test", None)
    print(t)

Note: spec = importlib.util.spec_from_file_location("script", file_path)
spec is None

import importlib
import importlib.util
import tempfile

with tempfile.NamedTemporaryFile(mode="w", delete=False) as tf:
    tf.write("""
class Test:
    def __init__(self):
        pass
""")
    tf.seek(0)

    file_path = tf.name

    spec = importlib.util.spec_from_file_location("script", file_path)
    print(f'{spec=}')
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)

    t = getattr(module, "Test", None)
    print(t)

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