没有定义 name‘ file’

我不太了解 python。我想开始工作的项目和安装说明说:

pip install -r requirements-dev.txt

很简单，问题是我明白了:

    Downloading/unpacking gunicorn==0.13.4 (from -r requirements.txt (line 7))
Running setup.py egg_info for package gunicorn
Traceback (most recent call last):
File "<string>", line 16, in <module>
File "/tmp/pip-build-root/gunicorn/setup.py", line 18, in <module>
long_description = file(
NameError: name 'file' is not defined
Complete output from command python setup.py egg_info:
Traceback (most recent call last):


File "<string>", line 16, in <module>


File "/tmp/pip-build-root/gunicorn/setup.py", line 18, in <module>


long_description = file(


NameError: name 'file' is not defined

我不明白这个问题，也许有人能帮忙？

我在 Arch Linux 上运行这个，python 默认为 python3，这个项目不是 python3，但我不确定是否是这样。

谢谢。