Question

what is the value of sys.argv[1] len(sys.argv[1]) for the command-line input > python prog.py 121 ?

Answer 1

The value of sys.argv[1] in the given command is '121', and len(sys.argv[1]) is 3, indicating the length of the first argument '121' which is 3 characters long.

Step-by-step explanation:

The sys.argv list in Python contains the command-line arguments passed to a script. When a Python script is run with the command python prog.py 121, sys.argv[1] represents the first argument after the script name, and in this case, it is the string '121'. The function len(sys.argv[1]) returns the length of this first argument, which counts the number of characters in the string '121'.

Therefore, the value of sys.argv[1] is '121', and len(sys.argv[1]) is 3 because there are three digits in '121'.

Answer 2

It can be seen that sys.argv[1] is the actual string argument passed to the script, while len(sys.argv[1]) is the number of characters in that string.

How to solve

In Python, sys.argv is a list containing all the command-line arguments passed to a script. When you run the command python prog.py 121, the resulting values of sys.argv[1] and len(sys.argv[1]) are:

sys.argv[1]: "121" (This is the first command-line argument, accessed by index 1)

len(sys.argv[1]): 3 (This is the length of the string "121")

Therefore, sys.argv[1] is the actual string argument passed to the script, while len(sys.argv[1]) is the number of characters in that string.