如何打印 PYTHONPATH 的内容
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how to print contents of PYTHONPATH
提问by
I have set path using
我已经使用设置路径
sys.path.insert(1, mypath)
Then, I tried to print contents of PYTHONPATH variable using os.environ as below
然后，我尝试使用 os.environ 打印 PYTHONPATH 变量的内容，如下所示
print(os.environ['PYTHONPATH'])
but I am getting error as
但我收到错误
raise KeyError(key)
KeyError: 'PYTHONPATH'
How can we print contents of PYTHONPATH variable.
我们如何打印 PYTHONPATH 变量的内容。
采纳答案by Maxime Lorant
I suggest not to rely on the raw PYTHONPATH because it can vary depending on the OS.
我建议不要依赖原始 PYTHONPATH，因为它会因操作系统而异。
Instead of the PYTHONPATH value in the os.environdict, use sys.pathfrom the sysmodule. This is preferrrable, because it is platform independent:
相反，在该PYTHONPATH值的os.environ字典，使用sys.path从sys模块。这是可取的，因为它是独立于平台的：
import sys
print(sys.path)
The value of sys.pathis initialized from the environment variable PYTHONPATH, plus an installation-dependent default (depending on your OS). For more info see
的值sys.path从环境变量 PYTHONPATH 初始化，加上依赖于安装的默认值（取决于您的操作系统）。有关更多信息，请参阅
https://docs.python.org/2/library/sys.html#sys.path
https://docs.python.org/2/library/sys.html#sys.path
回答by Jon Clements
If PYTHONPATHhasn't been set then that's expected, maybe default it to an empty string:
如果PYTHONPATH尚未设置，则是预期的，可能将其默认为空字符串：
import os
print(os.environ.get('PYTHONPATH', ''))
You may also be after:
您可能还在追求：
import sys
print(sys.path)
