tcsh shell 啟動 python 虛擬環境

一般來說，啟動 python 虛擬環境的指令是

source /venv/bin/activate

這個指令是把目前 python interpreter 的路徑加入 PATH 環境變數中，不過 tcsh 或是 csh 執行後會出現以下錯誤訊息：

Badly placed ()'s.

這是因為 tcsh 或是 csh 的指令不太一樣，要改執行：

source /venv/bin/activate.csh

FreeBSD 安裝 python3

FreeBSD 安裝python 很簡單，使用 pkg 安裝即可：

sudo pkg install python


安裝畫面如下所示：

密碼：
Updating FreeBSD repository catalogue...
Fetching meta.txz: 100%    944 B   0.9kB/s    00:01
Fetching packagesite.txz: 100%    6 MiB   6.5MB/s    00:01
Processing entries: 100%
FreeBSD repository update completed. 31528 packages processed.
All repositories are up to date.
The following 3 package(s) will be affected (of 0 checked):

New packages to be INSTALLED:
        python: 3.7_3,2
        python37: 3.7.6
        python3: 3_3

Number of packages to be installed: 3

The process will require 107 MiB more space.
16 MiB to be downloaded.

Proceed with this action? [y/N]: y
[1/3] Fetching python-3.7_3,2.txz: 100%    996 B   1.0kB/s    00:01
[2/3] Fetching python37-3.7.6.txz: 100%   16 MiB  16.4MB/s    00:01
[3/3] Fetching python3-3_3.txz: 100%    1 KiB   1.1kB/s    00:01
Checking integrity... done (0 conflicting)
[1/3] Installing python37-3.7.6...
[1/3] Extracting python37-3.7.6: 100%
[2/3] Installing python3-3_3...
[2/3] Extracting python3-3_3: 100%
[3/3] Installing python-3.7_3,2...
[3/3] Extracting python-3.7_3,2: 100%
=====
Message from python37-3.7.6:

--
Note that some standard Python modules are provided as separate ports
as they require additional dependencies. They are available as:

py37-gdbm       databases/py-gdbm@py37
py37-sqlite3    databases/py-sqlite3@py37
py37-tkinter    x11-toolkits/py-tkinter@py37

預設就是安裝 Python 3，現在裝好就有 pip 可以用，不用另外安裝。