如果我正确安装了 Pandas，为什么我的导入语句不能识别它？

我正在处理一个使用 csv 文件的项目，但是，我无法让 Pandas 工作。到目前为止，我研究的所有内容都告诉我要确保安装了 pandas。使用 pip 我设法安装了熊猫就好了。当我尝试运行 python 程序并导入 pandas 时，我得到：

Traceback (most recent call last):
  File "analysis.py", line 1, in <module>
    import pandas as pd
ImportError: No module named pandas     

我不知道这是否相关，但我试图看看这是否适用，conda install pandas但是，我收到此导入错误：

（同样，Anaconda 已正确安装在我的系统上）

Traceback (most recent call last):
  File "/usr/local/bin/conda", line 9, in <module>
load_entry_point('conda==4.2.7', 'console_scripts', 'conda')()
  File "/Library/Python/2.7/site-packages/pkg_resources/__init__.py", line 561, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
  File "/Library/Python/2.7/site-packages/pkg_resources/__init__.py", line 2627, in load_entry_point
return ep.load()
  File "/Library/Python/2.7/site-packages/pkg_resources/__init__.py", line 2287, in load
return self.resolve()
  File "/Library/Python/2.7/site-packages/pkg_resources/__init__.py", line 2293, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/Library/Python/2.7/site-packages/conda/cli/__init__.py", line 8, in <module>
from .main import main  # NOQA
  File "/Library/Python/2.7/site-packages/conda/cli/main.py", line 46, in <module>
from ..base.context import context
  File "/Library/Python/2.7/site-packages/conda/base/context.py", line 18, in <module>
from ..common.configuration import (Configuration, MapParameter, PrimitiveParameter,
  File "/Library/Python/2.7/site-packages/conda/common/configuration.py", line 40, in <module>
from ruamel.yaml.comments import CommentedSeq, CommentedMap  # pragma: no cover
ImportError: No module named ruamel.yaml.comments

任何人都有类似的导入库的经验？我试图确保我有正确的 Python3 版本，但这似乎不是问题。任何帮助将不胜感激！谢谢你。