TypeError: object of type 'int' has no len() - Python/Pygame

Question

I am creating a cookie clicker game, where there is a surface that displays how many cookies I have.

Here is my code for drawing text.

 def draw_text(self, text, font_name, size, color, x, y, align="nw"):
            font = pg.font.Font(font_name, size)
            text_surface = font.render(text, True, color)
            text_rect = text_surface.get_rect()
            self.screen.blit(text_surface, text_rect)

Then in the new function of my game loop (for when a new game starts), I created a variable:

def new(self):
        self.cookie_count = 0

And then finally, I have my drawing function.

def draw(self):
    self.draw_text('Cookies: {}'.format(len(self.cookie_count)), self.cookie_font, 105, SKYBLUE, 325, HEIGHT * 3/4, align="nw")
    pg.display.update()

Yet, when I run the program, I get:

TypeError: object of type 'int' has no len()

I am new to creating a "score counter" you could call it. But why does

self.draw_text('Cookies: {}'.format(len(self.cookie_count))

give me an error? How come the length of self.cookie_count is not printed?

I'm not quite sure what you're trying to do with len, but it doesn't work on int. len returns how long a string is. — TheDetective
– TheDetective, Commented Aug 3, 2017 at 17:27

Cuber · Accepted Answer · 2017-08-03 17:32:05Z

2

If you just want the value of self.cookie_count, you can just use

self.draw_text('Cookies: {}'.format(self.cookie_count)

The len() function returns the number of items in an object such as an array and does not work on an int object.

answered Aug 3, 2017 at 17:32

Cuber

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Comments

robinCTS · Accepted Answer · 2017-08-03 18:36:55Z

1

You can try removing the len() function as your self.cookie_count is already an int.

So your answer should be:

self.draw_text('Cookies: {}'.format(self.cookie_count))

edited Aug 3, 2017 at 18:36

robinCTS

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answered Aug 3, 2017 at 17:34

Abdeen

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1 Comment

robinCTS Over a year ago

Congratulations on your first answer. A couple of good tips for you: 1) Use backticks (`) to quote functions, variables and other code snippets inline. 2) Use four spaces at the start of a line to create a code block. These tips and other useful information can be found by clicking on the help icon at the top right hand corner of the answer box.

robinCTS · Accepted Answer · 2017-08-03 18:21:13Z

0

If you set self.cookie_count = 0 then its type is integer. len() works on lists, tuples and strings but not on integers.

edited Aug 3, 2017 at 18:21

robinCTS

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answered Aug 3, 2017 at 17:32

jrap3

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1 Comment

robinCTS Over a year ago

Using backticks (`) around inline code snippets helps to make answers clearer.

robinCTS · Accepted Answer · 2017-08-03 18:57:27Z

0

This is what you're looking for. len() is a container function, so len(int) gives an error. Use len(str(self.cookie_count)). Hope that helps!

EDIT: This will get you the number of digits in the integer, including a negative sign. For floats this will also count the decimal point. For small numbers (less than 10^16), it's faster to use

import math
digits = math.log10(n) + 1

but this is less readable. With large numbers, rounding imprecisions give an incorrect answer, and the simplicity of the string method far outweighs its lack of speed.

edited Aug 3, 2017 at 18:57

robinCTS

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answered Aug 3, 2017 at 17:30

TBlock

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5 Comments

xgord Over a year ago

You should put the relevant information from that link in your answer, as links can become deprecated over time.

juanpa.arrivillaga Over a year ago

len is not a "string or list function", it works for anything that implements __len__, and that is most built-in container types.

rlbond Over a year ago

note that your log10 algorithm only works on positive integers.

robinCTS Over a year ago

Just a helpful tip for you - if you use backticks (`) around inline code snippets it makes your answer clearer.

TBlock Over a year ago

@robinCTS Thanks! Totally forgot.

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