如果命令行语句和一行Python脚本 [英] If statements and one line python scripts from command line

问题描述

为什么我收到一个语法错误以下单行蟒蛇code？

Why do I receive a syntax error for the following one liner python code?

python -c 'import re; if True: print "HELLO";'
  File "<string>", line 1
    import re; if True: print "HELLO";
                ^
SyntaxError: invalid syntax

以下code的作品就好。

The following code works just fine

python -c 'if True: print "HELLO";'

我

如何修改我的一行执行的命令行单行我打算脚本？

How can I change my one line to execute my intended script on a single line from the command line?

推荐答案

要解决此限制的一种方法是使用指定的 $字符串格式命令换行转义序列 \\ n 。

One option to work around this limitation is to specify the command with the $'string' format using the newline escape sequence \n.

python -c $'import re\nif True: print "HELLO";'

请注意：这是被炮弹如bash和zsh的支持，但不是有效的POSIX SH

Note: this is supported by shells such as bash and zsh, but is not valid POSIX sh.

正如@slaadvak提到的，这里还有一些其他的解决方法：<一href=\"http://stackoverflow.com/questions/2043453/executing-python-multi-line-statements-in-the-one-line-command-line\">Executing在单行命令行 Python的多行语句

As mentioned by @slaadvak, there are some other workarounds here: Executing Python multi-line statements in the one-line command-line

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