python - Why an int is recognized as a float?

Question

I have to create an resize algorithm in python using pillow. Some var are in french. Here, i add to i at the end of a while (so i is always an int) and x is always an int since it's apart of the range. a[x] is a tuple.

from PIL import Image
photo=Image.open("meh.jpg")
from random import randint

taille=photo.size
largeur=int(taille[0]*facteur)
hauteur=int(taille[1]*facteur)
diffhauteur=hauteur-taille[1]
difflargeur=largeur-taille[0]
newImage= Image.new('RGB', (largeur,hauteur))

if diffhauteur>1:
    i=0
    while i !=taille[0]:
        a=[]
        for b in range(taille[1]):
            liste.append(photo.getpixel((i,b))) #get all the data of the pixels in the row
        for b in range(diffhauteur): #add some pixel  (gradient) to get the lenght of the new img
            index=randint(0,len(a)-2)
            pixel2=a[index+1]
            pixel1=a[index]
            ab=  degrade(pixel1,pixel2) #create a gradient of two pixels as a tuple
            a.insert(index,ab)
        for x in range (hauteur):#add the row to the new img
            newImage.putpixel((i,x),a[x])
        i=i+1

newImage.show()

But, i get this error:

#here are the values
a[x]=(0.0, 0.0, -1.0)
i=0
x=6
line 71, in resizing
    newImage.putpixel((i,x),a[x])
 
TypeError: integer argument expected, got float

This does'nt happen for a specific value. It's totally random

Someone have an answer? Because it seems tricky or just too easy I'm gonna ask to my teacher tomorrow but i don't know if i will be able to solve this. Thanks you

标签： pythonpython-3.xintegerpython-imaging-library

Answer 1

a[x] is not a tuple of ints as requested by the function, but a tuple of floats. Therefore, you have to convert this tuple to integer.

see here

You can map the tuple to integer:

for x in range (hauteur):
    a2 = tuple(map(int, a[x]))
    newImage.putpixel((i,x),a2)