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              Python 世界的開端: hello world

              假設你已經安裝好了Python, 那么在命令行窗口輸入:

              python

              將直接進入python。然后在命令行提示符>>>后面輸入:

              >>>print('Hello World!')

              可以看到,隨后在屏幕上輸出:

              Hello World!

              print是一個常用函數,其功能就是輸出括號中得字符串。

              (在Python 2.x中,print還可以是一個關鍵字,可寫成print ‘Hello World!’,但這在3.x中行不通?)

              寫一段小程序

              另一個使用Python的方法,是寫一個Python程序。用文本編輯器寫一個.py結尾的文件,比如說hello.py

              hello.py中寫入如下,并保存:

              print('Hello World!')

              退出文本編輯器,然后在命令行輸入:

              python hello.py

              來運行hello.py。可以看到Python隨后輸出

              Hello World!

              腳本

              我們還可以把Python程序hello.py改成一個可執行的腳本,直接執行:

              #!/usr/bin/env python
              print('Hello World!')

              需要修改上面程序的權限為可執行:

              chmod 755 hello.py

              然后在命令行中,輸入

              ./hello.py

              就可以直接運行了

              總結

              print

              命令行模式: 運行Python,在命令行輸入命令并執行。

              程序模式: 寫一段Python程序并運行。

              ————

              本文完,如果你想繼續學習,可以點擊下面的鏈接,繼續看:

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