python文件操作（创建与读取）
###############################创建文件############################################!/usr/bin/env python
'''make a test file'''
import os
ls = os.linesep
#get file name
fname = raw_input('Enter Filename: ')
while True:
if os.path.exists(fname):
print('ERROR: %s already exists' % fname )
exit()
break
else:
break
#get file content(test) 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
with open(fname,'w') as f:
f.writelines(['%s%s' %(x,ls) for x in all])
print 'DONE!'
###################################读取文件######################################
#!/usr/bin/env python
'''read and display text file'''
#get file name
fname = raw_input("Enter filename: ")
#attempt to open file for reading
try:
fobj = open(fname,'r')
except IOError,e:
print('***file open error:',e)
else:
#display content to the screen
for eachLine in fobj:
print eachLine
fobj.close()
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