Tag Archives: #mastery30

#Mastery30                                                        #TC1014                                                             @PablO_CVi

For reading and writing of files in python, the first step is to get a file object, and how we do this? well using the open” function.

The open function has two parameter, the first one is the name of the file that we are creating and the other parameter is going to check if you are going to read(r) or write(w) the file. Now for write inside of the file.write the name of the object we created followed by a dot with the word “write” adn you open parenthesis where you are going to write the text.Also is important to mark that the end line character is given by “/n”.And for save it we have to close our object.

this is the syntax: file = open(“newfile.txt”, “w”)

                                           file.write(“hello world in the new filen”)

                                           file.write(“and another linen”)

                                           file.close() 

the object name is file and the text file is example.

Now we know how to use write(), I can explain read().

usisng read() is use it for read the text file. the syntax is very simple like in write() method, just where we wrote “w” now we have to write “r”.

this is the syntax of this:

                                              file = open(‘newfile.txt’, ‘r’)

                                              print file.read()

                                              file.close()

In this example show us the two parameters, the first one tell us what text file is going to open and the second parameter tell us what is going to do, in this case “r” means that is going to read.And print mean that when you are in the terminal will print the text that is in the file. In this case it will print:

                                              hello world in the new file
                                              and another line

We can also specify how many characters the string should return, by using
file.read(n), where “n” determines number of characters.

This reads the first 5 characters of data and returns it as a string.

this will print : hello

I have learned all of these here: http://www.pythonforbeginners.com/files/reading-and-writing-files-in-python.