IT Systems, Networks, Security and Education
This is post 27 of 30 in the series “Introduction to Python” Using Pexpect “Pexpect is a pure Python module for spawning child applications; controlling them; and responding to expected patterns in their output. Pexpect works like Don Libes’ Expect. Pexpect allows your script to spawn a child application and control it as if a …
This is post 26 of 30 in the series “Introduction to Python” Go to Chapter 62 of A Smarter Way. In Python, you don’t handle files directly. Instead you create a file handle, which opens the file either read-only or read-write. It is important to close the file when you are done! The with syntax …
This is post 25 of 30 in the series “Introduction to Python” Go to Chapter 51 of A Smarter Way. Recall for loops: http://gnorman.org/2018/10/02/python-for-loops/ for friend in friends: print(“Hello, ” + friend.title() + “!”) For loops are good for meeting a single condition, once. But sometimes you need to keep performing the matching operation. This …
This is post 24 of 30 in the series “Introduction to Python” Go to Chapter 41 in A Smarter Way. A function in Python is like a function in math: you put something in, it gets transformed, and you get something out. There are two stages to using a function, defining it and calling it. …
This is post 23 of 30 in the series “Introduction to Python” Go to Chapter 25 in A Smarter Way. Python dictionaries are lists of key/value pairs: name: Bill address: 123 Main St. telephone: 222-333-4444 Go to Chapter 26 in A Smarter Way. Remember that key: value syntax. You’ll use it to create dictionaries: best_friend …
This is post 22 of 30 in the series “Introduction to Python” Go to Chapter 23 in A Smarter Way. You can ask for user input and put it into a variable in one line: user_age = input(“Enter your age: “) print(user_age) Anything the user enters will be treated as a string. Sometimes that’s a …
Continue reading “Python: Capturing and Formatting User Input”
This is post 21 of 30 in the series “Introduction to Python” Go to Chapter 22 in A Smarter Way. You can put a for-loop inside another for-loop: first_names = [“Bill”, “Joel”, “Jeff”, “Jim”] last_names = [“E-boy”, “E-man”, “Jefferson”, “O’theJungle”] full_names – [ ] for a_first_name in first_names: for a_last_name in last_names: full_names.append(a_first_name …
This is post 20 of 30 in the series “Introduction to Python” Go to Chapter 21 of A Smarter Way. Remember an earlier for loop we used: friends = [‘bill’, ‘jeff’, ‘jim’] for friend in friends: print(“Hello, ” + friend.title() + “!”) Often we use these inside if-tests: friends = [‘bill’, ‘joel’, ‘jeff’, ‘jim’, ‘scott’, …
This is post 19 of 30 in the series “Introduction to Python” Go to Chapter 20 of A Smarter Way. A tuple is like a list, but its elements cannot be changed once they’re defined. In a list we used square brackets to define the list: friends = [‘bill’, ‘jeff’, ‘jim’, ‘scott’, ‘joel’] By contrast, …
This is post 18 of 30 in the series “Introduction to Python” Go to Chapter 17 of A Smarter Way. Return to our lists page: http://introtopython.org/lists_tuples.html#Want-to-see-what-functions-are? …and scroll down slightly because the page TOC is (again) broken. Taking a slice from a list: friends = [‘bill’, ‘jeff’, ‘jim’, ‘scott’, ‘joel’] # Grab the first three …
Continue reading “Python: Lists: Take a Slice, Delete Elements, Popping Elements”