Printing the Float Numbers in Python for Cordinate System

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I am trying to write a method that generates and returns n random points in a 2-dimensional space given the width and height in Python I coded an algorithm but I want to recieve float points in the system. Here my code is:

import random    

npoints = int(input("Type the npoints:"))
width = int(input("Enter the Width you want:"))
height = int (input("Enter the Height you want:"))


allpoints = [(a,b) for a in range(width) for b in range(height)]
sample = random.sample(allpoints, npoints)

print(sample)

Output is:

Type the npoints:4
Enter the Width you want:10
Enter the Height you want:8
[(8, 7), (3, 3), (7, 7), (9, 0)]

How can I print them as float. For example: (8.75 , 6.31)

Thanks a lot for the help.

multidimensional-array floating-point for-loop list python
2 Answers

First you want to take float as input. For height & width replace the int() with float().

Now, you can't generate all point within the box defined by these any more since floating points can have arbitrary precision (theoretically).

So you need a way to generate the coordinates separately. A random y-coordinate between 0 & height can be generated by:

<random number between 0 to 1> * height

Similarly for the width. And you can use random.random() to get the random number between 0 to 1.

Full code:

import random

npoints = int(input("Type the npoints:"))
width = float(input("Enter the Width you want:"))
height = float(input("Enter the Height you want:"))

sample = []
for _ in range(npoints):
    sample.append((width * random.random(), height * random.random()))

print(sample)

Output:

Type the npoints:3
Enter the Width you want:2.5
Enter the Height you want:3.5
[(0.7136697226350142, 1.3640823010874898), (2.4598008083240517, 1.691902371689177), (1.955991673900633, 2.730363157986461)]
user_29473780

Change a and b to float:

import random    

npoints = int(input("Type the npoints:"))
width = int(input("Enter the Width you want:"))
height = int (input("Enter the Height you want:"))

# HERE ---------v--------v
allpoints = [(float(a),float(b)) for a in range(width) for b in range(height)]
sample = random.sample(allpoints, npoints)

print(sample)

Output:

Type the npoints:4
Enter the Width you want:10
Enter the Height you want:8
[(1.0, 0.0), (8.0, 7.0), (5.0, 1.0), (2.0, 5.0)]

Update

I want float but your solve is printing only like this: 2.0 5.0
How can we print like this: 5.56 2.75 ?

Print with 2 decimals:

>>> print(*[f"({w:.2f}, {h:.2f})" for w, h in sample], sep=', ')
(1.00, 0.00), (8.00, 7.00), (5.00, 1.00), (2.00, 5.00)
user_152399510
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