您可以在一个文件中声明所有常量，比如说 constants.py 然后将它们导入其他人。以下是一个示例：

You can declare all your constants in one file, say constants.py and then import them into others. Here is an example:

# constants.py
FOO = 'foo'
PI = 3.14

# main.py
import constants
print constants.PI