Delete final line in file with python

Question

How can one delete the very last line of a file with python?

Input File example:

hello
world
foo
bar

Output File example:

hello
world
foo

I've created the following code to find the number of lines in the file - but I do not know how to delete the specific line number.

    try:
        file = open("file")
    except IOError:
        print "Failed to read file."
    countLines = len(file.readlines())

Answer 1

You could use the above code and then:-

lines = file.readlines()
lines = lines[:-1]

This would give you an array of lines containing all lines but the last one.