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