man python 查看python的帮助文件
命令行参数：
-B Don't write .py[co] files on import. See also PYTHONDONTWRITEBYTECODE.当使用import的时候，不产生.pyc/.pyo文件
-c command Specify the command to execute (see next section). This terminates the option list (following options are passed as arguments to the command).直接指定执行的命令
举例：python -c 'print "shen"'
-d Turn on parser debugging output (for wizards only, depending on compila- tion options). -E Ignore environment variables like PYTHONPATH and PYTHONHOME that mod- ify the behavior of the interpreter. -h , -? , --help Prints the usage for the interpreter executable and exits.-i When a script is passed as first
argument or the -c option is used, enter interactive mode after execut- ing the script or the command. It does not read the $PYTHONSTARTUP file. This can be useful to inspect global variables or a stack trace when a script raises an exception.执行完命令、py文件后进入交互模式
举例：
python -i -c "print 'shen'"
shen>>> -m module-name Searches sys.path for the named mod- ule and runs the corresponding .py file as a script.在sys.path里的路径里搜索某个模块，并运行相应的.py文件
将模块按照脚本执行，最常见的用法是:
python -m SimpleHTTPServer 8081
在打开浏览器的8081端口，可以用于局域网的简单文件下载服务
-O Turn on basic optimizations. This changes the filename extension for compiled (bytecode) files from .pyc to .pyo. Given twice, causes doc- strings to be discarded. -OO Discard docstrings in addition to the -O optimizations.-R Turn on "hash randomization", so
that the hash() values of str, bytes and datetime objects are "salted" with an unpredictable pseudo-random value. Although they remain con- stant within an individual Python process, they are not predictable between repeated invocations of Python. This is intended to provide protec- tion against a denial of service caused by carefully-chosen inputs that exploit the worst case perfor- mance of a dict construction, O(n^2) complexity. See http://www.ocert.org/advi- sories/ocert-2011-003.html for details.-Q argument
Division control; see PEP 238. The argument must be one of "old" (the default, int/int and long/long return an int or long), "new" (new division semantics, i.e. int/int and long/long returns a float), "warn" (old division semantics with a warn- ing for int/int and long/long), or "warnall" (old division semantics with a warning for all use of the division operator). For a use of "warnall", see the Tools/scripts/fixdiv.py script. -s Don't add user site directory to sys.path. -S Disable the import of the module site and the site-dependent manipu- lations of sys.path that it entails.-t Issue a warning when a source file
mixes tabs and spaces for indenta- tion in a way that makes it depend on the worth of a tab expressed in spaces. Issue an error when the option is given twice. -u Force stdin, stdout and stderr to be totally unbuffered. On systems where it matters, also put stdin, stdout and stderr in binary mode. Note that there is internal buffer- ing in xreadlines(), readlines() and file-object iterators ("for line in sys.stdin") which is not influenced by this option. To work around this, you will want to use "sys.stdin.readline()" inside a "while 1:" loop. 对标准输入、输出、错误不进行缓存，直接输出；正常情况下都是等到缓冲区满了或者程序退出了才会打印数据举例：test.py内容如下
1 #!/usr/bin/env python2 # -*- coding: utf-8 -*-3 from time import sleep4 5 for i in range(10):6 print i7 sleep(1)
python test.py > ok.log 一次性把所有的数字（0~9）写入ok.log中，写一次，因为有缓存
python -u test.py > ok.log 一次把一个数字写入文件ok.log中，一共写10次
-v Print a message each time a module
is initialized, showing the place (filename or built-in module) from which it is loaded. When given twice, print a message for each file that is checked for when searching for a module. Also provides infor- mation on module cleanup at exit. 会输出每一个模块引用信息，包括从何处引用的，以及何时被清除的
-V , --version Prints the Python version number of the executable and exits.
-W argument
Warning control. Python sometimes prints warning message to sys.stderr. A typical warning mes- sage has the following form: file:line: category: message. By default, each warning is printed once for each source line where it occurs. This option controls how often warnings are printed. Multi- ple -W options may be given; when a warning matches more than one option, the action for the last matching option is performed. Invalid -W options are ignored (a warning message is printed about invalid options when the first warn- ing is issued). Warnings can also be controlled from within a Python program using the warnings module.The simplest form of argument is one of the following action strings (or a unique abbreviation): ignore to ignore all warnings; default to explicitly request the default behavior (printing each warning once per source line); all to print a warning each time it occurs (this may generate many messages if a warning is triggered repeatedly for the same source line, such as inside a loop); module to print each warn- ing only the first time it occurs in each module; once to print each warning only the first time it occurs in the program; or error to raise an exception instead of print- ing a warning message.The full form of argument is
action:message:category:module:line. Here, action is as explained above but only applies to messages that match the remaining fields. Empty fields match all values; trailing empty fields may be omitted. The message field matches the start of the warning message printed; this match is case-insensitive. The cat- egory field matches the warning cat- egory. This must be a class name; the match test whether the actual warning category of the message is a subclass of the specified warning category. The full class name must be given. The module field matches the (fully-qualified) module name; this match is case-sensitive. The line field matches the line number, where zero matches all line numbers and is thus equivalent to an omitted line number.-x Skip the first line of the source.
This is intended for a DOS specific hack only. Warning: the line num- bers in error messages will be off by one! -3 Warn about Python 3.x incompatibili- ties that 2to3 cannot trivially fix.