IT Systems, Networks, Security and Education
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”
This is post 17 of 30 in the series “Introduction to Python” Go to Chapter 16 of A Smarter Way. Return to our lists page: http://introtopython.org/lists_tuples.html#Common-List-Operations Change an item in a list: friends = [‘bill’, ‘jeff’, ‘jim’] friends[0] = ‘fred’ print(friends) Add an item to a list: friends.append(“joel”) # Note that we use parens, not …
This is post 16 of 30 in the series “Introduction to Python” Go to Chapter 15 of A Smarter Way. Let’s start out on this highly detailed page on handling lists: http://introtopython.org/lists_tuples.html#Introducing-Lists Create an empty list: friends = [] Populate a list: friends = [‘bill’, ‘jeff’, ‘jim’] for friend in friends: print(“Hello, ” + friend.title() …
This is post 15 of 30 in the series “Introduction to Python” Go to Chapter 13 of A Smarter Way. Now we’re into multiple nested conditions: if it’s 6:00 AM, and if you’re near a coffee shop, and if you have $5, it would be nice to get a latte. if time <= 6:00AM: if …
This is post 14 of 30 in the series “Introduction to Python” Go to Chapter 12 of A Smarter Way. What do you do if a test needs to meet two conditions at once? (Is this person both a Person and a Friend?) This is where the keywords and and or come into play. if …