Python 中的字符计数

Question

I am trying to write this program, which would tell me what's written in a text file and would also count the characters in that file. But I am stuck on the counting part. Here is my code.

def read_file(filename):
    infile = open(filename)
    
    
    for line in infile:
        print (line, end = "")
    print()
    
    print("There are",len(line),"letters in the file")
    
    infile.close() 

here is the output:

Humpty Dumpty sat on a wall,
Humpty Dumpty had a great fall.
All the king's horses and all the king's men
Couldn't put Humpty together again.
There are 35 letters in the file

The issue is its count the words as a whole and not characters. It should have said "There are 141 letters in the file" but it says 35. What am I doing wrong??

PS I am using Python 3.9.7

Answer 1

35 isn't the number of words in the file, it's the number of characters in the last line :

>>> len("Couldn't put Humpty together again.")
35

If you want to sum all the lengths of all the lines you'll want to do it in your loop:

    file_len = 0 
    for line in infile:
        print(line, end = "")
        file_len += len(line)
    print()

    print(f"There are {file_len} letters in the file")

Note that there's a difference between len(line) (the raw character count which includes punctuation, whitespace, etc) and the number of letters in the line:

>>> sum(c.isalpha() for c in "Couldn't put Humpty together again.")
29