On 2/27/2016 4:39 AM, Veek. M wrote:
I want to do something like:
#!/usr/bin/env python3
fh = open('/etc/motd')
for line in fh.readlines():
print(fh.tell())
why doesn't this work as expected.. fh.readlines() should return a
generator object and fh.tell() ought to start at 0 first.
Not after you have already read some data. Readlines() reads the entire
file and splits it into lines. readline reads at least a single block.
Reading a single byte or character at a time looking for /n would be
too slow, so even after readline, the file pointer will be somewhere
past the end of the last line returned.
Instead i get the final count repeated for the number of lines.
What i'm trying to do is lookahead:
#!whatever
fh = open(whatever)
for line in fh.readlines():
x = fh.tell()
temp = fh.readline()
fh.seek(x)
--
Terry Jan Reedy
--
https://mail.python.org/mailman/listinfo/python-list
