Erle Robotics Learning Python GitBook Free

Exercises: File Input /Output

Exercise 1

Write a program to prompt for a file name, and then read through the file line-by-line. Note: the file name is Erle.txtand its content is,

Erle is the enabling technology for the
next generation of aerial and terrestrial
robots that will be used in cities solving
tasks such as surveillance, enviromental
monitoring or even providing aid at catastrophes.

Ensure you create the file.

Exercise 2

Create a file called new_world.txt.First add a new line to the file:Welcome to robotics time.. And then print the content of new_world.txt.

Solutions

Exercise 1

The solution code is the following:

  name=raw_input("Enter the file name:")

  my_file=open(name,"r")

  print my_file.readline()
  print my_file.readline()
  print my_file.readline()
  print my_file.readline()


 my_file.close

Store this in e_py.pyfile. The result of the execution is:

 root@erlerobot:~/Python_files# python e_py.py
Enter the file name:Erle.txt
Erle is the enabling technology for the

next generation of aerial and terrestrial

robots that will be used in cities solving

tasks such as surveillance, enviromental

root@erlerobot:~/Python_files#

Exericse 2

The code should be stored on nworld.pyand then executed:

 my_file=open("new_world.txt","r+")

 line= "Welcome to robotics time."
 my_file.write(line)

 print  my_file.read()

 my_file.close()

root@erlerobot:~/Python_files# python nworld.py
Welcome to robotics time.