Iterating over the characters in a string: BEHIND THE SCENES!
Welcome!
Hi! Welcome to this short tutorial! We will discuss how to iterate over the character in a string, a very important concept for the course and you Computer Science journey.
Syntax
On the diagram below you can see the general syntax for iterating over the items contained in an iterable (strings are iterables and their “items” are the individual characters they contain)
Ready? Set! Go!
Once we start out for loop, the variable we’ve defined to be used in the for loop (in this case,
char) will be updated on each iteration (see code in the "output" column on the diagram below).
What does this mean?
- When the loop is run first time,
char’s value will beH. - When the loop runs for the second time,
char’s value will bee
And so on! The loop will run as many times as the number of characters in the string and the variable
char will update its value wherever you’ve used it inside the loop.
In this case, we’ve printed its value. As you can see, it first prints
H, then e and so on until it prints every character in the string, one at a time.
Hello, would you please show how you assigned char as the variable that will be used in the loop?
ReplyDeleteHi, on the last example, 'char' is the variable used in the loop because of this line of code included in the "output" column:
Deletefor char in s:
The variable used after `for` will be the variable updated on every loop iteration.