Import essence, import

Import essence, import

I. Module: it is used to logically organize python code (variables, functions, classes, logic, and implement a function). In essence, it is the python file ending with py.

1.1 import method:

Import module

Import module1, module2

From module import logger

From module import logger as frank

1.2 import essence: Explain the python file again

1.3 import module_name

In fact, it is equivalent to copying all the code of module_name. To use it, use the variables and functions module_name.name, module_name.logger.

1.4 from module_name import name

In fact, it is equivalent to copying the name part of module_name to this part. You can directly reference name = 'Alex 'and directly call the variable name.

 

Ii. Package: logically organize a module, which is essentially a directory (a directory with the _ init _. py file)

1.1 import essence: Execute the _ init _. py file under the package directory

1.2 Import Optimization:

Instance, the following code needs to constantly call the module module_test. If there are 200 such calls, you have to find them back and forth, affecting efficiency, in this case, you can convert "import module_test" to "from module_test import test"

def logger():       module_test.test()    print(' in the logger')def search():    module_test.test()    print("in the search")