Python File handling example?

Answer 1

To open a text file, use:
fh = open("hello.txt", "r")

To read a text file, use:
fh = open("hello.txt","r")
print fh.read()

To read one line at a time, use:
fh = open("hello".txt", "r")
print fh.readline()

To read a list of lines use:
fh = open("hello.txt.", "r")
print fh.readlines()

To write to a file, use:
fh = open("hello.txt","w")
write("Hello World")
fh.close()

To write to a file, use:
fh = open("hello.txt", "w")
lines_of_text = ["a line of text", "another line of text", "a third line"]
fh.writelines(lines_of_text)
fh.close()

To append to file, use:
fh = open("Hello.txt", "a")
write("Hello World again")
fh.close

To close a file, use
fh = open("hello.txt", "r")
print fh.read()
fh.close()

Answer 2

you can you the with statement which is a good practice:

with open('file.txt', 'w') as f:
f.write('Hello world!')

note:if you use with you dont have to close the file (f.close()) with does it for you when the statement is done

Answer 3

filename = "hello.txt"
file = open(filename, "r")
for line in file:
print line,