Python学习之路——初显身手

第一个Python程序

#!/usr/bin/env python

'makeTextFile.py -- create text file'

import os
ls = os.linesep

#get filename
while True:
fname = raw_input('Please enter file name: ')
if os.path.exists(fname):
print 'Error: %s already exists' % fname
else:
break

#get file content (text) lines
all = []
print 'Enter lines (. by itself to quit).'

#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
fobj = open(fname, 'w')
fobj.writelines(['%s%s' % (x, ls) for x in all])
fobj.close()
print 'Done!'

#!/usr/bin/env python

'readTextFile.py -- read and display text file'

#get filename
fname = raw_input('Please enter file name: ')
print

#attempt to open file for reading
try:
fobj = open(fname, 'r')
except IOError, e:
print '*** file open error:', e
else:
#display contents to the screen
for eachLine in fobj:
print eachLine,
fobj.close()