Python 3 latest code crumbs

While loop

While loop

Jan 16, 2022 by erik

While the for-loop in Python is a bit hard to understand, the while loop is actually much simpler! In this example, we see an expression that follows the while statement: i <= 4. As long as this expression evaluates to...

Python for loop and lists

Python for loop and lists

Jan 16, 2022 by erik

A Python list can contain zero or more objects. It's a frequently used data type in Python programming. In other programming languages, lists are often called arrays. Python does not have arrays, though, only lists. We can loop, or iterate,...

The print function

The print function

Jan 16, 2022 by erik

The Python print function can print text to your screen. We can feed it one or more arguments, and these arguments will get printed on the screen. In its most basic form, we can call print without any argument. In...

If statement

If statement

Jan 16, 2022 by erik

The if statement is a so-called conditional statement. It is followed by an expression that can evaluate to either True or False. If the expression evaluates to True, the block of code that follows is executed. If it evaluates to...

Python exception handling with try.. except

Python exception handling with try.. except

Dec 30, 2021 by erik

This is a small assignment from the Python try-except tutorial. Please do the following: 1. Run the code below, notice the file name (it doesn't exist). See what happens. 2. Change the file name in the Python code to myfile.txt...

How to reverse a Python list

How to reverse a Python list

Dec 27, 2021 by erik

There are actually three methods you can use to reverse a list: 1. An in-place reverse, using the built-in reverse method that every list has natively 2. Using list slicing with a negative step size, which results in a new...