Does Python have an argc argument?

Question

I have written the same program (open text file and display contents) in C and C++. Now am doing the same in Python (on a Linux machine).

In the C programs I used the code:

if (argc != 2) {     /* exit program */ } 

Question: What is used in Python to check the number of arguments

#!/usr/bin/python import sys try:     in_file = open(sys.argv[1], "r") except:     sys.exit("ERROR. Did you make a mistake in the spelling") text = in_file.read() print text in_file.close() 

Current output:

./python names.txt = Displays text file (correct) ./python nam = error message: stated from the sys.ext line (correct) ./python = error message: stated from the sys.ext line (wrong: want it to be a separate error message stating *no file name input*) 

Answer 1

In python a list knows its length, so you can just do len(sys.argv) to get the number of elements in argv.