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On Linux / Unix systems, general default python version 2.x, we can python3.x installed in / usr / local / python3 directory.
After installation is complete, we can add the path / usr / local / python3 / bin to your Linux / Unix operating system environment variables, so you can enter the following command to start a terminal shell Python3.
$ PATH=$PATH:/usr/local/python3/bin/python3 # 设置环境变量 $ python3 --version Python 3.4.0
Under Window system you can be set by the following command Python environment variables, suppose your Python installation in the C: \ Python34:
set path=%path%;C:\python34
We can enter the "Python" command at a command prompt to start the Python interpreter:
$ python3
After executing the above command, the following message window:
$ 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 in python prompt, and then press Enter to view operating results:
print ("Hello, Python!");
Results of the above command as follows:
Hello, Python!
When you type a multi-line structure, the continuation is necessary. We can look at the following if statement:
>>> flag = True >>> if flag : /en. print("flag 条件为 True!") /en. flag 条件为 True!
Hello.py copy the following code to the file:
print ("Hello, Python!");
By the following command to execute the script:
python3 hello.py
The output is:
Hello, Python!
In Linux / Unix systems, you can add the following command at the top of the script to make Python scripts can be executed the same as SHELL script directly:
#! /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!