centos自定義安裝pip3



題記

在以前的文章centos雲服務器安裝Python3記錄 記錄了怎麼自定義安裝 Python3 ，在後邊測試pip3的時候發現了個問題：

pip --version

terminal 打印：

pip 8.1.2 from /usr/lib/python2.7/site-packages (python 2.7)

如上：pip版本仍是 Python2.7 版本

解決

因爲對於系統和Python並非特別熟悉，首先想到的是問下度娘。度娘給了幾種建議所有是下載pip再安裝。我沒有急於執行而是去看了下 官方文檔
其中有這樣的表述：


大概意思是：

1.看下系統內pip是否可用：

[root@liuyonghu python3]# pip --version
pip 8.1.2 from /usr/lib/python2.7/site-packages (python 2.7)

2.查看pip是否存在於安裝包

[root@liuyonghu python3]# python -m ensurepip --default-pip

Looking in links: /tmp/tmpzzl1ppca

Requirement already satisfied: setuptools in ./lib/python3.7/site-packages (39.0.1)

Requirement already satisfied: pip in ./lib/python3.7/site-packages (10.0.1)

3. 由步驟 2 可知，pip3已經存在於 Python3.7 的安裝文件中，只是沒有對應的軟鏈

[root@liuyonghu bin]# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

[root@liuyonghu bin]# pip3 --version
pip 10.0.1 from /usr/local/python3/lib/python3.7/site-packages/pip (python 3.7)

4.想起來本身mac上的pip仍是用的pip3，因而也修改軟鏈。

Last login: Sat Sep 29 23:13:21 on ttys002
liuyonghudeMacBook-Pro:~ liuyonghu$ pip3 --version
pip 9.0.1 from /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (python 3.6)

liuyonghudeMacBook-Pro:~ liuyonghu$ which python3
/usr/local/bin/python3

liuyonghudeMacBook-Pro:~ liuyonghu$ which pip3

/usr/local/bin/pip3

liuyonghudeMacBook-Pro:~ liuyonghu$ ln -s /Library/Frameworks/Python.framework/Versions/3.6/bin/pip3 /usr/local/bin/pip

liuyonghudeMacBook-Pro:~ liuyonghu$ pip --version

pip 9.0.1 from /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (python 3.6)

5. 其實中間查找pip路徑的步驟比較費勁，也記錄下來。

[root@liuyonghu python3]# pip --version
pip 8.1.2 from /usr/lib/python2.7/site-packages (python 2.7)
[root@liuyonghu python3]# python -m ensurepip --default-pip
Looking in links: /tmp/tmpzzl1ppca
Requirement already satisfied: setuptools in ./lib/python3.7/site-packages (39.0.1)
Requirement already satisfied: pip in ./lib/python3.7/site-packages (10.0.1)
[root@liuyonghu python3]# cd /user/bin
-bash: cd: /user/bin: 沒有那個文件或目錄
[root@liuyonghu python3]# cd /usr/bin
[root@liuyonghu bin]# ls pip*
pip  pip2  pip2.7
[root@liuyonghu bin]# mv pip pip.bak
[root@liuyonghu bin]# cd ./lib/python3.7/site-packages (10.0.1)
-bash: 未預期的符號 `(' 附近有語法錯誤
[root@liuyonghu bin]# cd usr/lib/python3.7/site-packages (10.0.1)
-bash: 未預期的符號 `(' 附近有語法錯誤
[root@liuyonghu bin]# cd usr/lib/python3.7/site-packages 
-bash: cd: usr/lib/python3.7/site-packages: 沒有那個文件或目錄
[root@liuyonghu bin]# mv pip.bak pip
[root@liuyonghu bin]# ls pip*
pip  pip2  pip2.7
[root@liuyonghu bin]# cd usr/lib/python3.7
-bash: cd: usr/lib/python3.7: 沒有那個文件或目錄
[root@liuyonghu bin]# cd usr/local/python3
-bash: cd: usr/local/python3: 沒有那個文件或目錄
[root@liuyonghu bin]# cd /usr/lib/python3.7
-bash: cd: /usr/lib/python3.7: 沒有那個文件或目錄
[root@liuyonghu bin]# cd /usr/local
[root@liuyonghu local]# cd python3
[root@liuyonghu python3]# ls pip*
ls: 沒法訪問pip*: 沒有那個文件或目錄
[root@liuyonghu python3]# ls
bin  include  lib  share
[root@liuyonghu python3]# cd lib
[root@liuyonghu lib]# cd lib
-bash: cd: lib: 沒有那個文件或目錄
[root@liuyonghu lib]# ls pip*
ls: 沒法訪問pip*: 沒有那個文件或目錄
[root@liuyonghu lib]# cd ..
[root@liuyonghu python3]# cd bin
[root@liuyonghu bin]# ls pip*
pip3  pip3.7
[root@liuyonghu bin]# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
[root@liuyonghu bin]# pip3 --version
pip 10.0.1 from /usr/local/python3/lib/python3.7/site-packages/pip (python 3.7)

總結：

1.Python3 在解壓，在預約目錄，編譯安裝以後，生成了Python、pip的執行文件。

2.在系統中的指令存在於不一樣系統的 /usr/*/bin/ 文件夾中，若有須要能夠本身去創建軟鏈。

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