我正在尝试使用 pip 安装 nltk，但不一定会出错，但我也不确定这意味着什么

Question

因此，我正在运行安装 nltk 的命令，并且不断收到以下消息。 要求得到满足，但是我尝试在我的脚本上导入 nltk 它不起作用。

-MBP-2 ~ % pip install --user -U nltk
Requirement already up-to-date: nltk in ./opt/anaconda3/lib/python3.8/site-packages (3.5)
Requirement already satisfied, skipping upgrade: regex in ./opt/anaconda3/lib/python3.8/site-packages (from nltk) (2020.10.15)
Requirement already satisfied, skipping upgrade: tqdm in ./opt/anaconda3/lib/python3.8/site-packages (from nltk) (4.50.2)
Requirement already satisfied, skipping upgrade: click in ./opt/anaconda3/lib/python3.8/site-packages (from nltk) (7.1.2)
Requirement already satisfied, skipping upgrade: joblib in ./opt/anaconda3/lib/python3.8/site-packages (from nltk) (0.17.0)

Answer 1

看起来它已安装，但在非默认位置，因此 python 找不到它。

首先你应该找出它的位置（它看起来像./opt/anaconda3/lib/python3.8/site-packages ）然后你可以扩展路径。 有两种方法可以扩展变量PYTHONPATH ：

# assuming you're on *nix
export PYTHONPATH=~/opt/anaconda3/lib/python3.8/site-packages:$PYTHONPATH

# for a permanent fix place it in your .bashrc
echo "export PYTHONPATH=~/opt/anaconda3/lib/python3.8/site-packages:$PYTHONPATH" >> .bashrc

或者扩展脚本中的路径：

import sys
sys.path.append('/home/<user>/opt/anaconda3/lib/python3.8/site-packages')
import nltk

如果要检查当前路径，可以使用： python -c 'import sys; print (sys.path)' python -c 'import sys; print (sys.path)'