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")

Could you tell me why we need "len(fname)<1"?

I have the same problem with 54 lines ,anybody can help?

In the txt, there are two types of lines starts with 'From'

1. From [email protected] Sat Jan 5 09:14:16 2008
2. From: [email protected]
   The question require us to pick out line type 2
   The code should be like:

Hello I got the exact output but I don't have any clue to find the error itself, can anyone help me?

This one worked for me:

#Open the file mbox-short.txt
fname = input('Enter files name: ')
fop = open(fname)
count = 0
#read it line by line
for line in fop:
#When you find a line that starts with 'From
if line.startswith('From'):
if not line.startswith('From:'):
count += 1
#You will parse the From line using split()
for word in line.split():
#Then print out a count at the end
if '@' in word:
wrd = word
print(wrd)
print("There were", count, "lines in the file with From as the first word")

fname = input("Enter file name: ")
fh = open(fname)
count = 0
for line in fh :
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")

fname = input("Enter file name: ")
of = open(fname) #mbox-short.txt

count=0

for lines in of:
if lines.startswith('From '):

    count= count+1
    
    lne1=lines.strip()
    lne2=lne1.split()
    
    print(lne2[1])

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

fname=input('enter a file name:')
file=open(fname)
c=0
for i in file:

if i.startswith('From '):
    c=c+1
    print(i.split()[1])

print('There were',c, 'lines in the file with From as the first word')

The Best Option

filee = open(input("Enter file name: "))
count = 0
for line in filee:
if not line.startswith("From"): continue
words = line.split()
if words[0] == "From:":conti
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....