Converting Between int, str, and float

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Do curso por University of Toronto

Aprenda os Fundamentos da Programação

2026 classificações

University of Toronto

Aprenda os Fundamentos da Programação

2026 classificações

Behind every mouse click and touch-screen tap, there is a computer program that makes things happen. This course introduces the fundamental building blocks of programming and teaches you how to write fun and useful programs using the Python language.

Na lição

Booleans, Import, Namespaces, and if Statements

This module introduces Booleans (logical values True and False), how to convert between types, how to use Boolean expressions in if statements to selectively run code, and the concept of a Python module.

Functions, Variables, and the Call Stack4:31

Converting Between int, str, and float3:16

Import: Using Non-Built-in Functions5:29

Conheça os instrutores

Jennifer Campbell
Associate Professor, Teaching Stream
Department of Computer Science
Paul Gries
Associate Professor, Teaching Stream
Department of Computer Science

The three types you've seen so far are interster and float, turns out you can

convert between them as follows. I'm going to take the number three and I'm

going to call something called sturd, that gives me back a string of length one

contained in the letter three, I can assign this to a variable.

Three is the string contained in the letter three.

Since it's a string, I can multiply it by whatever I like.

Let's make 77 3's, just for the fun of it. As you might guess, I can go the other

direction. If I have five copies of this string

three. In other words, a string of link five

containing five letter 3's. Then, I can take that and I can turn it

into an int. There we go, 33,333.

I can even use the result of that and convert it back to a string.

Giving me what I would have gotten if I had just multiplied three by five.

I can also convert floats to strings. If I use INT on a string containing

several digits, then I can get back that integer by extracting that value from the

string. I can also.

Do the same thing with a float. Notice that I gave float a string

containing letters that form an int and it turned that into a floating point number.

I have to be a little bit careful if I call int on a string that has things other

than digits in it, I'm actually going to get an error.

Here, forever all I'm going to get is a value ever, invalid literal for int with

base ten, I have seven apples. That's just announcing that Python was

unable to do the conversion. A motivation for one thing is, this is

that, if I call input, say, tell me the number of shoes.

And the user types, say, 863 shoes is the number they want.

I get back a string if my shoe store has only 627 shoes left then I can't right now

compare the string 863 to the number 627. The solution here is to take the result of

what the user types and turn it into an int.

Save it in a variable and now I can do my comparison.

Are there enough shoes left in order to satisfy my customer?

And the answer is no.

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