Writing to a file

Perform the following steps in order to write to a file:

1. The first step in writing to a file is opening a file with the write flag: w. If the file name that was passed as an argument doesn't exist, a new file is created:

      file = open('write_file.txt', 'w')

2. Once the file is open, the next step is passing the string to be written as argument to the write() function:

      file.write('I am excited to learn Python using
      Raspberry Pi Zero')

3. Let's put the code together where we write a string to a text file, close it, re-open the file and print the contents of the file to the screen:

       if __name__ == "__main__": 
          # open text file to write
          file = open('write_file.txt', 'w') 
          # write a line from the file
          file.write('I am excited to learn Python using
          Raspberry Pi Zero \n') 
          file.close() 

          file = open('write_file.txt', 'r') 
          data = file.read() 
          print(data) 
          file.close()

4. The preceding code snippet is available for download along with this chapter (write_to_file.py).
5. When the preceding code snippet is executed, the output is shown as follows:

       I am excited to learn Python using Raspberry Pi Zero