文件句柄超出范围后是否会在 Python 中自动关闭? [英] Does filehandle get closed automatically in Python after it goes out of scope?
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问题描述
如果我执行以下操作,文件句柄是否会在超出 Python 范围时自动关闭:
If I do the following, does filehandle get closed automatically as it goes out of scope in Python:
def read_contents(file_path):
return file(file_path).read()
如果没有,我该如何编写这个函数来自动关闭作用域?
If it doesn't, how can I write this function to close the scope automatically?
推荐答案
它应该在文件的 __del__
语句中关闭文件句柄,但更好的方法是使用 with
块:
It should close the file handle in the file's __del__
statement, but a better approach would be to use a with
block:
def read_contents(file_path):
with open(file_path, 'r') as f:
return f.read()
参见 http://docs.python.org/library/stdtypes.html#file.close 了解更多信息.
See http://docs.python.org/library/stdtypes.html#file.close for more information.
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