Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "This method will call the method exec of the Runner to execute the function that performs the requests to the Twitter API."

A block of code is set as follows:

def set_header(self):
    title = Label(self,
                  text='Voting for hasthags',
                  font=("Helvetica", 24),
                  height=4)
    title.pack()

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

def start_app(args):
    root = Tk()
    app = Application(hashtags=args.hashtags, master=root)
    app.master.title("Twitter votes")
    app.master.geometry("400x700+100+100")
    app.mainloop()

Any command-line input or output is written as follows:

python app.py --hashtags debian ubuntu arch

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "It says, Logged as with your username, and right after it there is a logout link. Give it a go, and click on the link Log off"