1、在win10系统上使用组合键WIN + R ,启动运行窗口，在运行窗口中输入cmd ，点击确定按钮
2、启动一个cmd命令行窗口
3、在cmd命令行窗口中输入python -V，有下图所示的回显，说明python3的环境已经安装到电脑上了，可以运行python脚本。
python -V的功能如下：
python -V （大写）与 python --version 功能相同，是将 python 版本打印并退出 python。
环境变量没有设置成功。需要重新设置环境变量。右键点击"我的电脑"->属性->高级系统设置->环境变量，在系统变量栏目中，找到Path，双击编辑后，添加刚才安装python的路径，添加完环境变量后，再输入命令python–v验证即可。python-v是以一种特殊模式进入python，该模式下每次有模块被初始化就会打印相应信息，展示载入的模块名或者内置模块。首先这个命令不是在python交互环境下运行的，其次需要使用python -V要大写的V才可以输出版本号，如下：
其它命令说明：
C:\>python --help
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options and arguments (and corresponding environment variables):
-b : issue warnings about str(bytes_instance), str(bytearray_instance)
and comparing bytes/bytearray with str. (-bb: issue errors)
-B : don't write .pyc files on importalso PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d : debug output from parseralso PYTHONDEBUG=x
-E : ignore PYTHON* environment variables (such as PYTHONPATH)
-h : print this help message and exit (also --help)
-i : inspect interactively after running scriptforces a prompt even
if stdin does not appear to be a terminalalso PYTHONINSPECT=x
-I : isolate Python from the user's environment (implies -E and -s)
-m mod : run library module as a script (terminates option list)
-O : remove assert and __debug__-dependent statementsadd .opt-1 before
.pyc extensionalso PYTHONOPTIMIZE=x
-OO : do -O changes and also discard docstringsadd .opt-2 before
.pyc extension
-q : don't print version and copyright messages on interactive startup
-s : don't add user site directory to sys.pathalso PYTHONNOUSERSITE
-S : don't imply 'import site' on initialization
-u : force the binary I/O layers of stdout and stderr to be unbuffered
stdin is always bufferedtext I/O layer will be line-buffered
also PYTHONUNBUFFERED=x
-v : verbose (trace import statements)also PYTHONVERBOSE=x
can be supplied multiple times to increase verbosity
-V : print the Python version number and exit (also --version)
when given twice, print more information about the build
-W arg : warning controlarg is action:message:category:module:lineno
also PYTHONWARNINGS=arg
-x : skip first line of source, allowing use of non-Unix forms of #!cmd
-X opt : set implementation-specific option
file : program read from script file
- : program read from stdin (defaultinteractive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]
