# -*- coding: utf-8 -*-

file_name=input("请输入文件名：")
file_name=file_name+".txt"
something_file=open(file_name,"w")

stopword=":q"
file_content=""
print("请输入内容【单独输入‘:q‘保存退出】：")
for line in iter(input,stopword):
 file_content=file_content+line+"\n"
print (file_content,file=something_file)
something_file.close()

# -*- coding: utf-8 -*-

def file_write(file_name):
 f = open(file_name, 'w')
 print('请输入内容【单独输入\':q\'保存退出】：')

 while True:
  file_content = input()
  if file_content != ':q':
   f.write('%s\n' % file_content)
  else:
   break

 f.close()

file_name = input('请输入文件名：')
file_write(file_name)