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第一章: Python 之 第一個程序

python

在linux環境上安裝python3.6.2程序.

到官網下載源碼包安裝:

技術分享

安裝python3.6.2的系統依賴包:

yun -y install zlib*

解壓安裝包:

tar -xvf Python-3.6.2.tar

進入安裝目錄:

cd Python-3.6.2

添加配置,指定安裝位置:

./configure --prefix=/usr/local/python

編譯源碼並執行安裝:

make && make install

到安裝路徑下驗證安裝是否成功:

[[email protected] bin]# pwd

/usr/local/python/bin

[[email protected] bin]# ./python3.6

Python 3.6.2 (default, Sep 8 2017, 11:30:01)

[GCC 4.4.7 20120313 (Red Hat 4.4.7-18)] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> print("hello world")

hello world

系統默認python版本為2.6(與python3.0以上不兼容)

[[email protected] ~]# which python

/usr/bin/python

[[email protected] ~]# python

Python 2.6.6 (r266:84292, Aug 18 2016, 15:13:37)

[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

將系統默認的python2.6移除,以方便後繼所有python程序,默認使用python3

[[email protected] bin]# which python

/usr/bin/python

[[email protected] bin]# mv /usr/bin/python /usr/bin/python.bak

[[email protected] bin]# ln -s /usr/local/python/bin/python3.6 /usr/bin/python

[[email protected] bin]# python

Python 3.6.2 (default, Sep 8 2017, 11:30:01) #此時系統python已經替換為3.6

[GCC 4.4.7 20120313 (Red Hat 4.4.7-18)] on linux

Type "help", "copyright", "credits" or "license" for more information.

系統有兩個python版本,2.6和3.6,分別寫一個hello world 的腳本。

python2.6:

#!/usr/bin/python2.6

print ‘hello world!‘

python3.6:

#!/usr/bin/python

print ‘hello world!‘

分別成功執行,如下:

[[email protected] py]# ./py2.6-hello.py

hello world

[[email protected] py]# ./py3.6-hello.py

File "./py3.6-hello.py", line 2

print ‘hello world!‘

^

SyntaxError: Missing parentheses in call to ‘print‘

因為py3.6-hello.py是一個python2的語法,此時我們只需要將頭部聲音改為python2.6就可正常運行。


本文出自 “學習旅程” 博客,請務必保留此出處http://mingkang.blog.51cto.com/9678221/1964117

第一章: Python 之 第一個程序