2.2.2 执行Python脚本 Executable Python Scripts

On BSD'ish Unix systems, Python scripts can be made directly executable, like shell scripts, by putting the line

BSD类的 Unix系统中，Python 脚本可以像 Shell 脚本那样直接执行，只要在脚本文件开头写一行命令，指定文件和模式：

#! /usr/bin/env python

(assuming that the interpreter is on the user's PATH) at the beginning of the script and giving the file an executable mode. The "#!" must be the first two characters of the file. On some platforms, this first line must end with a Unix-style line ending ("\n"), not a Mac OS ("\r") or Windows ("\r\n") line ending. Note that the hash, or pound, character, "#", is used to start a comment in Python.

(将用户路径通知解释器) "#!"必须是文件的前两个字符，在某些平台上，第一行必须以 Unix 风格的行结束符（"\n"）结束，不能用Mac（"\ r"）或Windows（"\r\ n"）的结束符。注意，"#"是Python中是行注释的起始符。

The script can be given a executable mode, or permission, using the chmod command:

脚本可以通过 chmod 命令指定执行模式和许可权。

$ chmod +x myscript.py