code iterates one line at a time, expecting the tell method to return the position of the current pointer. But what is actually returned is the last location of the entire document;
Please help me to see what the problem is?
My Daily.txt
Good morning:
As we known, Chengdu IS one of largest cities in the world!
Set up
get up
take off
OKthe code is as follows
with open(r"My Daily", "r+") as f:
for line in f:
print f.tell()when using for traversal on the file object f, the contents of f are read out and iterable objects are generated for traversal.
so your output is always at the end
for line in f:
is when the f.next ().
f.next () method is called, the f.tell () method cannot be called
if you need to return the current pointer position, you can do this
pos = 0
with open (r'My Daily', 'ringing') as f:
for line in f:
pos += len(lien)
-sharpprint f.tell()
print(post)