UPDATE 2 (November 2017)
Sorry for not having updated this in so many years. 2004 was a different Peter and I'm sorry if people landed on this blog post and got the wrong idea.
To read lines from a file do this:
with open('somefile.txt') as f:
for line in f:
print(line)This works universally in Python 2 and Python 3. It reads one line at a time by iterating till it finds line breaks.
readline() and readlines(). The answer is in the name. readline() reads one readlines() reads in the whole file at once and splits it by line.
These would then be equivalent:
f = open('somefile.txt','r')
for line in f.readlines():
print line
f.close()
# ...and...
f = open('somefile.txt','r')
for line in f.read().split('\n'):
print line
f.close()The xreadlines() function should be used for big files:
f = open('HUGE.log','r'):
for line in f.xreadlines():
print line
f.close()Truncated! Read the rest by clicking the link below.
Python UnZipped
March 11, 2004
0 comments Python
Zipping and unzipping a file in Python is child-play. It can't get much easier than this. Well, in Windows you can highlight a couple of files and right-click and select from the WinZip menu. Here's how to do it in Python:
>>> import zipfile
>>> zip = zipfile.ZipFile('Python.zip', 'w')
>>> zip.write('file1.txt')
>>> zip.write('file2.gif')
>>> zip.close()Still confused? Read this article for "Dev Shed"n:http://www.devshed.com/ then. The article includes some more advanced uses as well.
