Python Call file path

1. Get the current execution main script method: Sys.argv[0] and _ file _

(1) SYS.ARGV

A list of instruction parameters to be passed to the Python script. Sys.argv[0] is the name of the script. Generally get a relative path, with Os.path.abspath (Sys.argv[0]) to get the absolute path of the execution file:

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12	dirname, filename = os.path.split(os.path.abspath(sys.argv[0])) os.path.realpath(sys.argv[0])

If you execute sys.argv on the command line, return the interpreter path: ['/library/frameworks/python.framework/versions/3.6/bin/ipython3 ']

(2) _ _ File_ _

Obtain the path where the current execution module is located, typically a relative path, with Os.path.abspath (_ _ file_ _) to get the absolute path of the executable file:

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12	dirname, filename = os.path.split(os.path.abspath( _ _ file_ _)) os.path.realpath(_ _ file_ _)

Note: Under the Python console, direct use of the print _ _ file _ is causing the name ' _ file _ ' is not defined error, because there is no script executed at this time, naturally no _ file _ _ Definition.

(3) Sys.argv[0] And _ _ File _ _ Difference: in the main execution file, there is no difference between the two, but if under different files, it is different, such as a.py,b.py two of the files

The execution a.py results are as follows:

As the result can be seen: if all are a.py the same result, but from the import of B in a sys.argv[0] or refers to the running main file: a.py and _ _ file_ _ but output is b.py

2.sys.path

A list of strings for the module search path. Initialized by the environment variable Pythonpath. is a list of directories, Sys.path[0] is the directory in which the current script that invokes the Python interpreter resides, the parent directory of the primary execution file.

Example: Execute in/user/ybp/a.py file a.py: print (sys.path[0]) ==>/USER/YBP,

Executes the return empty string at the command line;

3. Note that Os.path is a system environment variable, to differentiate from the above, there are no os.path[0],os.path methods:

(1) os.path.split (path)

Divides the path name into a pair of headers and tails. The tail will never have a slash. If the input path ends with a slash, then the empty tail is obtained.

If the input path does not have a slash, then the head part is empty. If the input path is empty, then the resulting header and tail are empty.

Https://docs.python.org/2/library/os.path.html#os.path.split

(2) Os.path.realpath (path)

Returns the absolute path of a specific file name, which can be executed at the command line.

Https://docs.python.org/2/library/os.path.html#os.path.realpath

4.OS.GETCWD () returns the current working path, not necessarily in the script, this command is equivalent to PWD, can be executed on the command line, the return is an absolute path;

Python Call file path