# testio.py
print "testio.py  write then read file  testio.dat"
f=open("testio.dat", "w")  # open for writing
f.write("line 1\n")        # no line feed, \ n, unless you use it
f.write("line 2\n")
f.close                    # be nice, close any file you open
print "wrote and closed testio.dat"

f=open("testio.dat", "r")  # open for reading
print "read and print  testio.dat  one line at a time"
a=f.readline()             # f  is the file handle
while a != "":             # null  returned for end of file
  a=a[:-1] # remove \ n to avoid extra blank line
  print a
  a=f.readline()
print a                    # should be a null string
print "expect eof yet just reads null strings"
a=f.readline()
print a                    # printing null string is blank line on dispaly
a=f.readline()
print a
a=f.readline()
print a
f.close

f=open("testio.dat", "r")
print "again,read and print testio.dat"
while True:
  a=f.readline()
  if not a:                # not the null string is true
    break
  a=a[:-1]
  print a
f.close

f=open("testio.dat", "r")
print "read entire file into a, print with one statement"
a=f.read()
print "print entire file, one long string, with line feeds"
print a
f.close