我正在嘗試使用 pip 安裝 nltk，但不一定會出錯，但我也不確定這意味着什么

Question

因此，我正在運行安裝 nltk 的命令，並且不斷收到以下消息。 要求得到滿足，但是我嘗試在我的腳本上導入 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

看起來它已安裝，但在非默認位置，因此 python 找不到它。

首先你應該找出它的位置（它看起來像./opt/anaconda3/lib/python3.8/site-packages ）然后你可以擴展路徑。 有兩種方法可以擴展變量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

或者擴展腳本中的路徑：

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

如果要檢查當前路徑，可以使用： python -c 'import sys; print (sys.path)' python -c 'import sys; print (sys.path)'