获取 Python 错误“来自：无法读取 /var/mail/Bio”
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Getting Python error "from: can't read /var/mail/Bio"
提问by brucezepplin
I am running a (bio)python script which results in the following error:
我正在运行一个 (bio)python 脚本，它导致以下错误：
from: can't read /var/mail/Bio
seeing as my script doesn't have anything to with mail, I don't understand why my script is looking in /var/mail.
看到我的脚本与邮件没有任何关系，我不明白为什么我的脚本在 /var/mail 中查找。
What seems to be the problem here? i doubt it will help as the script doesn't seem to be the problem, but here's my script anyway:
这里似乎有什么问题？我怀疑它会有所帮助，因为脚本似乎不是问题，但无论如何这是我的脚本：
from Bio import SeqIO
from Bio.SeqUtils import ProtParam
handle = open("examplefasta.fasta")
for record in SeqIO.parse(handle, "fasta"):
seq = str(record.seq)
X = ProtParam.ProteinAnalysis(seq)
print X.count_amino_acids()
print X.get_amino_acids_percent()
print X.molecular_weight()
print X.aromaticity()
print X.instability_index()
print X.flexibility()
print X.isoelectric_point()
print X.secondary_structure_fraction()
what is the problem here? bad python setup? I really don't think it's the script.
这里有什么问题？糟糕的python设置？我真的不认为这是剧本。
采纳答案by Tamás
No, it's not the script, it's the fact that your script is not executed by Python at all. If your script is stored in a file named script.py, you have to execute it as python script.py, otherwise the default shell will execute it and it will bail out at the fromkeyword. (Incidentally, fromis the name of a command line utility which prints names of those who have sent mail to the given username, so that's why it tries to access the mailboxes).
不，这不是脚本，而是您的脚本根本不是由 Python 执行的。如果您的脚本存储在名为 的文件中script.py，则必须将其作为 执行python script.py，否则默认 shell 将执行它并在from关键字处退出。（顺便说一下，from是一个命令行实用程序的名称，它打印向给定用户名发送邮件的人的姓名，这就是它尝试访问邮箱的原因）。
Another possibility is to add the following line to the top of the script:
另一种可能性是将以下行添加到脚本的顶部：
#!/usr/bin/env python
This will instruct your shell to execute the script via pythoninstead of trying to interpret it on its own.
这将指示您的 shell 通过执行脚本python而不是尝试自行解释它。
回答by Ehsan Quranwala
I ran into a similar error
我遇到了类似的错误
"from: can't read /var/mail/django.test.utils"
“来自：无法读取/var/mail/django.test.utils”
when trying to run a command
尝试运行命令时
>>> from django.test.utils import setup_test_environment
>>> setup_test_environment()
in the tutorial at https://docs.djangoproject.com/en/1.8/intro/tutorial05/
在https://docs.djangoproject.com/en/1.8/intro/tutorial05/的教程中
after reading the answer by Tamás I realized I was not trying this command in the python shell but in the termnial (this can happen to those new to linux)
在阅读了 Tamás 的答案后，我意识到我不是在 python shell 中尝试这个命令，而是在 termnial（这可能发生在那些刚接触 linux 的人身上）
solution was to first enter in the python shell with the command python and when you get these >>> then run any python commands
解决方案是首先使用命令 python 进入 python shell，当你得到这些时 >>> 然后运行任何 python 命令
回答by Sergii Shcherbak
Same here. I had this error when running an import command from terminal without activating python3 shell through manage.py in a django project (yes, I am a newbie yet). As one must expect, activating shell allowed the command to be interpreted correctly.
同样在这里。我在从终端运行导入命令时遇到了这个错误，而没有通过 django 项目中的 manage.py 激活 python3 shell（是的，我还是个新手）。正如人们所期望的那样，激活 shell 允许正确解释命令。
./manage.py shell
and only then
然后才
>>> from django.contrib.sites.models import Site
回答by Z.Davey
Put this at the top of your .py file (for python 2.x)
把它放在 .py 文件的顶部（对于 python 2.x）
#!/usr/bin/env python
or for python 3.x
或者对于 python 3.x
#!/usr/bin/env python3
This should look up the python environment, without it, it will execute the code as if it were not python code, but straight to the CLI. If you need to specify a manual location of python environment put
这应该查找 python 环境，没有它，它将执行代码，就好像它不是 python 代码一样，而是直接到 CLI。如果需要手动指定python环境放置的位置
#!/#path/#to/#python
回答by Suraj Kumar
for Mac OS just go to applications and just run these Scripts Install Certificates.command and Update Shell Profile.command, now it will work.
对于 Mac OS，只需转到应用程序并运行这些脚本安装 Certificates.command 和更新 Shell Profile.command，现在它就可以工作了。
回答by Dhara Patel
I got same error because I was trying to run on
我遇到了同样的错误，因为我试图继续
XXX-Macmini:Python-Project XXX.XXX$ from classDemo import MyClass
from: can't read /var/mail/classDemo
To solve this, type command pythonand when you get these >>> then run any python commands
要解决这个问题，输入命令python，当你得到这些时 >>> 然后运行任何 python 命令
>>>from classDemo import MyClass
>>>f = MyClass()
