Python 读写文件的两个简单实例

import os

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

# get file content
all = []
print "Enter lines '.' to quit.\n"

# loop until user terminate input
while True:
line = raw_input('> ')
if line == '.':
break
else:
all.append(line)

# write line to file
fobj = open(filename, 'w')
fobj.write('\n'.join(all))
fobj.close()

print 'Done!'

# 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 error:", e
else:
# display contents to the screen
for eachLine in fobj:
print eachLine,
fobj.close()