(Python) Question with starts with a repeat statement

name = input('Enter file name: ')
if len(name) < 1 : name = 'mbox-short.txt'
handle = open(name)

counts = dict()

for line in handle :
    if 'From' in line :
        print(line) 

In the question of finding a specific word, I found it using sentences as usual. That's how it turned out

From [email protected] Sat Jan  5 09:14:16 2008
From: [email protected]
From [email protected] Fri Jan  4 18:10:48 2008
From: [email protected]
From [email protected] Fri Jan  4 16:10:39 2008
From: [email protected]
...

The e-mail address was repeated once again and printed in the same way as above. At that time, I thought it was stored in the text like this. I was searching for the code because I couldn't solve it, so I was searching for the code in the same code

startswith('From')

I only changed it to

From [email protected] Sat Jan  5 09:14:16 2008
From [email protected] Fri Jan  4 18:10:48 2008
From [email protected] Fri Jan  4 16:10:39 2008
From [email protected] Fri Jan  4 15:46:24 2008
From [email protected] Fri Jan  4 15:03:18 2008
From [email protected] Fri Jan  4 14:50:18 2008

As above, the line that had only the email address disappeared. I'm trying to solve it at a different price, so it's a waste. I wonder why the output results are so different in whether or not the function is used. What's the reason? Why was the way I used wrong? Please give me some advice.