By Michael Driscoll
Python 201 is the sequel to my first publication, Python one zero one. should you already understand the fundamentals of Python and now you need to visit the subsequent point, then this can be the booklet for you! This ebook is for intermediate point Python programmers in basic terms. There will not be any newbie chapters right here. This e-book relies onPython three.
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Add_argument('-x', '--execute', action="store", required=True, 2 help='Help text for option X') You will note that a long option is more than one character in length and that it must start with two dashes instead of one. Options that Conflict What do you do if you have options that conflict with each other? A common example would be running your application in verbose mode versus quiet mode. You can run it in either mode, but not both. How do we prevent the user from running it that way though?
Let’s look at an example! 1 >>> from functools import partial 2 >>> def add(x, y): 3 ... return x + y 4 ... 5 >>> p_add = partial(add, 2) 6 >>> p_add(4) 7 6 Here we create a simple adding function that returns the result of adding its arguments, x and y. Next we create a new callable by creating an instance of partial and passing it our function and an argument for that function. In other words, we are basically defaulting the x parameter of our add function to the number 2. Finally we call our new callable, p_add, with the argument of the number 4 which results in 6 because 2 + 4 = 6.
Let’s pretend that we want to create an application that has some defaults. The application will also be aware of the operating system’s environment variables. If there is an environment variable that matches one of the keys that we are defaulting to in our application, the the environment will override our default. Let’s further pretend that we can pass arguments to our application. These arguments take precendence over the environment and the defaults. This is one place where a ChainMap can really shine.