尝试读取文件并在异常回退到备用文件的情况下的 Pythonic 方法

nitin_cherian

尝试读取文件的 Pythonic 方法是什么，如果此读取会引发异常回退以读取备用文件？

这是我写的示例代码，它使用了嵌套的try-except块。这是pythonic吗：

try:
    with open(file1, "r") as f:
        params = json.load(f)
except IOError:
    try:
        with open(file2, "r") as f:
            params = json.load(f)
    except Exception as exc:
        print("Error reading config file {}: {}".format(file2, str(exc)))
        params = {}
except Exception as exc:
    print("Error reading config file {}: {}".format(file1, str(exc)))
    params = {}

MSeifert

对于两个文件，我认为这种方法已经足够好了。

如果您有更多文件要回退，我会使用循环：

for filename in (file1, file2):
    try:
        with open(filename, "r") as fin:
            params = json.load(f)
        break
    except IOError:
        pass
    except Exception as exc:
        print("Error reading config file {}: {}".format(filename, str(exc)))
        params = {}
        break
else:   # else is executed if the loop wasn't terminated by break
    print("Couldn't open any file")
    params = {}

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