8.5 Open the file mbox-short.txt and read it line by line. When you find a line that starts with 'From ' like the following line: From [email protected] Sat Jan 5 09:14:16 2008 You will parse the From line using split() and print out the second word in the line (i.e. the entire address of the person who sent the message). Then print out…

py4e_ex_08_05

fhand = open("mbox-short.txt")
count = 0
for line in fhand:
    line = line.rstrip()
    if line == "": continue
        
    words = line.split()
    if words[0] !="From": continue
        
    print(words[1])
    count = count+1

print ("There were", count, "lines in the file with From as the first word")

I would like to ask what is the role of the command below?

if len(fname) < 1: fname = 'mbox-short.txt'

I think we do not need to specify, but I saw the code example and see that they have these two lines, which I am not sure how useful this is.

fname = input("Enter file name: ") if len(fname) < 1: fname = 'mbox-short.txt' fh = open(fname) count = 0 for line in fh: line = line.rstrip() if not line.startswith('From: ') : continue words = line.split() print(words[1]) count = count + 1 print("There were", count, "lines in the file with From as the first word")

if you are prompting the user to enter the file name, you don't need again to assign the file name. Compare my image below....