Python import usage and the difference with From...import

This article mainly introduced the Python import usage as well as with the from...import difference, this article concise clear, very easy to understand, needs the friend to be possible to refer to under

In Python, import or from...import the appropriate module. module is actually a number of functions and classes of the collection file, it can implement some of the corresponding functions, when we need to use these functions, directly to the corresponding module into our program, we can use. This is similar to the Include header file in C, in Python we import the modules we need using import.

eg

The code is as follows:

Import Sys

Print (' ================python import mode========================== ');

Print (' command line arguments are: ')

For I in SYS.ARGV:

Print (i)

Print (' n The Python path ', Sys.path)

From sys import Argv,path # import specific members

Print (' ================python from import=================================== ')

Print (' path: ', path ') # because you have imported the path member, you do not need to add sys.path when referencing here

If you want to use the name of all the SYS modules, you can do this:

The code is as follows:

From SYS import *

Print (' path: ', path)

From the above we can simply see:

############################

#导入modules, the difference between import and From...import is simply that:

# If you want to use argv to represent SYS.ARGV in the program,

# You can use: from sys import argv

# Generally, you should avoid using from. Import and use the import statement,

# because it will make your program easier to read and avoid name conflicts

###########################