Python path Import

Problem:

Recently in the study of import, found not like import xxx, or from xxx import ooo

So simple. For example, look at the following diagram:

Do you want to import to call pre.tab.py in te.py??

Direct import:

Import Pre_tab

Traceback (most recent):  File "c:/users/administrator/pycharmprojects/laonanhai/shop_store/test/te.py ", line +, in <module>    import pre_tabimporterror:no module named ' Pre_tab '

Knowledge Points:

By watching the video, I learned the following two points:

1. Os.path.abspath (__file__) returns the absolute path of the current file
Under the te.py file:

Import OSX = Os.path.abspath (__file__) print (x)

Output:

View Code

2.os.path.dirname ()  returns the previous layer path of the current file

Under the te.py file:

X1 = Os.path.dirname (os.path.dirname (x)) print (x1) sys.path.append (x1) Print (Sys.path

Output:

View Code

Finally, you can see through print (Sys.path) that
C:\Users\Administrator\PycharmProjects\laonanhai\shop_store path has been added to Sys.path

Extra Harvest

Under the pre_tab.py file:

"" "C:\Users\Administrator\PycharmProjects\laonanhai\shop_store\pre_tab.py" "" Print ("AA")

Unexpectedly, the exposure of the wrong!!!

SyntaxError: (Unicode error) ' Unicodeescape ' codec can ' t decode bytes in position 3-4: truncated \uxxxxxxxx escape

Later, reference

http://blog.csdn.net/wlsyn/article/details/49613867 Original is the file path, the backslash \u the error, after the backslash and add a backslash escaped on the line, after testing, the code after the comment does not error, remove the comments, can also read and write files normally


Essay supplement: About __IMPORT__

obj = __import__ ("Lib.manager") print (obj)    #没有导入manager. Py#<module ' lib ' from ' c:\\users\\administrator\\ pycharmprojects\\laonanhai\\day6_test\\lib\\__init__.py ' >obj.order ()     #AttributeError: ' Module ' object has No attribute ' order '
Obj1 = __import__ ("Lib.manager", Fromlist=true)   #表示按路径连接方式导入print (obj1)   #导入manager #<module ' Lib.manager ' From ' c:\\users\\administrator\\pycharmprojects\\laonanhai\\day6_test\\lib\\manager.py ' >obj1.order ()    # successful execution of the order () method for manager.py under Lib

Source: Http://www.cnblogs.com/0zcL

Python path Import