Read a file in Python

gistfile1.py

# The built-in function `open` opens a file and returns a file object.
# Read mode opens a file for reading only.
try:
    f = open("file.txt", "r")
    try:
        # Read the entire contents of a file at once.
        string = f.read()
        # OR iterate over the file line-by-line:
        for line in f:
            # Do something with line.
        # OR read one line at a time.
        line = f.readline()
        # OR read all the lines into a list.
        lines = f.readlines()
    finally:
        f.close()
except IOError:
    #FIXME: Do something!
    pass