Core Python上的第一个程序

#!/usr/bin/env python

#'makeTextFile.py  -- create text file'

import os
ls= os.linesep

#get filename

while True:
fname = raw_input('input file name:')
if os.path.exists(fname):
print "Error: '%s' already exists" % fname
break
else:
#get file content
all = []
print "\nEnter lines ('.' by itself to quit).\n"

#loop until user terminates input
while True:
entry = raw_input('>')
if entry == '.':
break
else:
all.append(entry)
#write lines to file with proper line-ending
print 'file name:%s' % fname
fobj = open(fname, 'w')
fobj.writelines(['%s%s' % (x, ls) for x in all])
fobj.close()
print 'Done!'
print 'Exit~!'

#!/usr/bin/env python

'readTextFile.py  -- read text file'

#get filename
fname = raw_input('Enter filename:')
print

#attemp to open file for reading
try:
fobj = open(fname, 'r')
except IOError, e:
print "***file open failed:",e
else:
#print file content
for eachline in fobj:
print eachline,
fobj.close()