Python Basics

3:46 Lesson 1 Your first program A computer is not clever. It cannot guess what you meant. It does exactly what you tell it, and nothing … 3:37 Lesson 2 Variables Suppose your program mentions the same city three times. You could type it again, and again, and again —… 3:07 Lesson 3 Numbers & operators You do not have to teach Python arithmetic — it already knows. Write plus, minus, times, and it answers … 2:57 Lesson 4 Getting input Every program so far has known everything in advance. Here the greeting works perfectly — for Sam. You w… 3:09 Lesson 5 Working with strings You have printed text and stored text. Getting one piece OUT of a piece of text is a different job, and … 3:32 Lesson 6 Making decisions Everything you have written so far does the same thing every time it runs. Real programs need to choose.… 3:03 Lesson 7 Counting loops To print the numbers one to five you could write it five times. It works. Now print one to five hundred,… 3:00 Lesson 8 While loops A for loop is perfect when you know the count in advance: print one to five, five passes, done. But now … 2:48 Lesson 9 Lists Five test scores, and so far you would give them a name each: score one, score two, and so on. It works … 2:52 Lesson 10 Functions You have written the same four lines twice: total starts at zero, loop, divide by the length. If a third… 3:04 Lesson 11 Scope & arguments Think of your program as a room, and every function call as a smaller room inside it. A variable made in… 2:36 Lesson 12 Dictionaries Store a book in a list and you have to remember which position holds what. Was slot one the number of pa… 3:23 Lesson 13 Planning & pseudocode When a task gets hard, the temptation is to start typing and hope. The faster way is to write the steps … 3:01 Lesson 14 Errors & testing Errors come in three kinds, and telling them apart tells you where to look. A syntax error breaks Python… 2:27 Lesson 15 Putting it all together This is the last lesson, and it builds one small tool out of everything so far. You start with one list …