python - Why does my script write every input string twice to the output file? -

when @ wrote it's double. example if write 'dog' ill 'dogdog'. why?

reading , writing file, filename taken command line arguments:

from sys import argv  script,text=argv  def reading(f):     print f.read()  def writing(f):     print f.write(line)  filename=open(text) #opening file   reading(filename)  filename.close()  filename=open(text,'w')  line=raw_input()  filename.write(line)  writing(filename)   filename.close() 

as said output getting double value of input giving.

you getting double value because writing 2 times

1) function call

def writing(f):     print f.write(line) 

2) writing in file using filename.write(line)

use code:

from sys import argv  script,text=argv  def reading(f):     print f.read()  def writing(f):     print f.write(line)  filename=open(text,'w')  line=raw_input()  writing(filename)   filename.close() 

and no need close file 2 times, once finished read , write operations close it.