奇怪的 Python 导入错误

Question

我遇到了这个非常奇怪的错误，我在从 AWS EMR 的主目录启动的 Python shell 中收到导入错误，而相同的包在以下情况下导入正常我 cd 进入另一个目录并在那里启动 Python shell。

EMR 已安装 Python 2.7。请让我知道我可以提供哪些额外信息。这个问题快把我逼疯了！

$ python
Python 2.7.16 (default, Mar 18 2019, 18:38:44)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import smtplib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python2.7/smtplib.py", line 46, in <module>
    import email.utils
  File "email.py", line 2, in <module>
    from email.mime.multipart import MIMEMultipart
ImportError: No module named mime.multipart
>>> os.path.realpath('./')
'/home/abc123'
>>>

$ mkdir temp
$ cd temp
[temp]$ python
Python 2.7.16 (default, Mar 18 2019, 18:38:44)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import smtplib
>>> os.path.realpath('./')
'/home/abc12/temp'

Answer 1

第一个（主）目录中是否有名为 email.py 的文件？或者名为 email 的文件夹？如果是，那么这可能会影响导入行为，因为 python 的查找机制（应用根目录优先于其他导入）。

来自 docs：（强调我的）

When a module named spam is imported, the interpreter first searches for a built-in module with that name. If not found, it then searches for a file named spam.py in a list of directories given by the variable sys.path. sys.path is initialized from these locations:

The directory containing the input script (or the current directory when no file is specified).

PYTHONPATH (a list of directory names, with the same syntax as the shell variable PATH).

The installation-dependent default.

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