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Python interactive programming

We can start the Python interpreter by entering the "Python" command in the command prompt:

$ python3

After executing the above command, the following window information appears:

$ python3
Python 3.4.0 (default, Apr 11 2014, 13:05:11) 
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

Enter the following statement at the python prompt and press Enter to see the effect:

print ("Hello, Python!");

The result of executing the above command is as follows:

Hello, Python!

Continuation lines are required when typing a multiline structure. We can look at the following if statement:

>>> flag = True
>>> if flag :
...     print("flag 条件为 True!")
... 
flag 条件为 True!

Python scripting programming

Copy the following code to the hello.py file:

print ("Hello, Python!");

Execute the script with the following command:

python3 hello.py

The output is:

Hello, Python!

On Linux/Unix systems, you can make Python scripts directly executable like SHELL scripts by adding the following command at the top of the script:

#! /usr/bin/env python3

Then modify the script permissions to have execute permissions, the command is as follows:

$ chmod +x hello.py

Execute the following command:

./hello.py

The output is:

Hello, Python!

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