python命令行模式的用法及流程

1、使用cmd打开命令行窗口。

2、在输入python时，进入python交互模式。

3、输入exit()，退出交互模式，在命令行模式下运行.py程序。

实例

C:\Users\86178>python
Python 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> edit
Traceback (most recent call last):
File "", line 1, in
NameError: name 'edit' is not defined
>>> exit()

C:\Users\86178>python
Python 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> hello.py
Traceback (most recent call last):
File "", line 1, in
NameError: name 'hello' is not defined
>>> exit()

C:\Users\86178>python hello.pu
python: can't open file 'hello.pu': [Errno 2] No such file or directory

C:\Users\86178>python hello.py
python: can't open file 'hello.py': [Errno 2] No such file or directory

C:\Users\86178>cd /d
文件名、目录名或卷标语法不正确。

C:\Users\86178>cd /d D:

D:\>python hello.py
hello
D:\>python
Python 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> hello.py
Traceback (most recent call last):
File "", line 1, in
NameError: name 'hello' is not defined
>>>

知识点扩充：

命令行模式与python交互模式

1.在命令行模式下，可以执行 python 进入 Python 交互式环境，也可以执

行 python hello.py 运行一个.py 文件。

2.在 Python 交互式环境下，只能输入 Python 代码并立刻执行。

3.Python 交互式环境会把每一行 Python 代码的结果自动打印出来，但是，直接运行 Python 代码却不会。