Through the argv attribute of Python sys module, you can get the command line parameters of running Python program. The attribute value is a list, and the relationship between list elements and running parameters is as follows.
$python python-program-file param1 param2 ...... ''' python-program-file: for example test.py, it is the first element in list argv (argv[0]). param1: the second element in list argv (argv[1]). param2: the third element in list argv (argv[2]). ...... '''
Therefore, if you need to get the parameters passed in when running a Python program, you can use argv [1], argv [2] to get it. Save below source code in a Python file test.py.
from sys import argv # Get argv length. args_len = len(argv) # Print argv length. print(args_len) # Traverse each element of the argv list and print out it's value. for arg in argv: print(arg)
Now run the above python file with the command python test.py p1 p2
in a terminal, you will get beow output.
$ python test.py p1 p2 3 test.py p1 p2
If a parameter itself contains a space, it should be enclosed in double quotation marks (“), otherwise, Python will treat the space as a parameter separator instead of the parameter itself.
# Use double quotation to wrap input parameters which has whitespace in it. $ python test.py "hello world" 2 test.py hello world $ python test.py hello world 3 test.py hello world