Python Day05 python environment variables and import module import

1.Definition

Module: The essence is a file ending in .py (logically organizing python code). The essence of a module is to implement a function. The file name is the module name

Package: A folder with __init__.py; used to store module files

2. Import module

import module name

form module name import *

from module name import module name as new name

3. Import module essence

import module name ===》 Assign all data in the module to the module name. The module name.method name () is required when calling.

from module name import method name ==》Put this method into the current file and run it once. When calling, you only need the method name () to run it

Importing a package is to execute the __init__.py file under the package

Path search

import sys,os

os.path.abspath(__file__) #Get the full name of the current file

os.path.dirname() #Get the parent directory of the current object

sys.path.insert()#Add the path of the current object to the first place

sys.path.append() # Add the current environment variable to the end of the environment variable

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