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Multiple python version installs
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=== Mac & Linux === <pre> $ python -V $ python -version $ /usr/bin/env python -V 預期看到 Python 2.7.10 或其他 2.x 版本 $ python3 -V $ python3 -version $ /usr/bin/env python3 -V 預期看到 Python 3.6.4 或其他 3.x 版本 </pre> {{Tips}} 如果不小心打到小寫 {{kbd | key=<nowiki>v</nowiki>}} 也就是 {{kbd | key=<nowiki>python -v</nowiki>}},會看到一長串指令,最後游標停在 {{kbd | key=<nowiki>>>></nowiki>}} 符號前面。有兩種方式就可以離開 {{kbd | key=<nowiki>>>></nowiki>}} 世界 (python 互動模式<ref>[https://stackoverflow.com/questions/16420078/what-do-the-three-arrow-signs-mean-in-python What do the three arrow (">>>") signs mean in python? - Stack Overflow]</ref>): (1) 輸入 {{kbd | key=<nowiki>exit()</nowiki>}} 或按組合鍵 {{kbd | key=<nowiki>ctrl+d</nowiki>}} (2) 再按 {{kbd | key=<nowiki>Enter</nowiki>}} 或 {{kbd | key=<nowiki>return</nowiki>}} 按鍵
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