+ 1

Where is the Parentheses error

points = [ (12, 55), (880, 123), (64, 64), (190, 1024), (77, 33), (42, 11), (0, 90) ] distance = list(range(len(points))) z = 0 for (x,y) in points: distance[z] = math.sqrt((x**2) + (y**2)) z += 1 print(min(distance))

21st Apr 2023, 7:31 PM
ARBEIT MANN
ARBEIT MANN - avatar
6 ответов
+ 6
You can avoid the math library, by expressing square as the power to the 1/2. In Python we don't really need to initialize an array with a fixed size, like in C. We can build the list dynamically. The most pythonic way is writing a list comprehension, which already contains creating the list and adding all the elements: distance = [(x**2 + y**2)**0.5 for x, y in points]
22nd Apr 2023, 3:37 AM
Tibor Santa
Tibor Santa - avatar
+ 5
The code you provided calculates the Euclidean distance between each point in a list and the origin (0, 0) and outputs the minimum distance. I don't see any issues with the parentheses in this code. However, there is a missing import statement for the `math` module, which is used to calculate the square root. You should add the following line at the beginning of your code: ``` import math ``` Here's the updated code with the import statement added: ``` import math points = [ (12, 55), (880, 123), (64, 64), (190, 1024), (77, 33), (42, 11), (0, 90) ] distance = list(range(len(points))) z = 0 for (x, y) in points: distance[z] = math.sqrt((x**2) + (y**2)) z += 1 print(min(distance)) ``` This code should run without any issues and output the minimum distance.
21st Apr 2023, 8:29 PM
Omar Mohamed
Omar Mohamed - avatar
+ 5
tamaslud Since all list items will be overwritten in the loop, the initial value is irrelevant. In fact, there's no need to initialize. Good point on enumerate.
22nd Apr 2023, 3:19 AM
Emerson Prado
Emerson Prado - avatar
+ 5
TENGRANN SAN You don't need to initialize the list, nor refer to each individual index, or even check its length. Read about list method "append".
22nd Apr 2023, 3:22 AM
Emerson Prado
Emerson Prado - avatar
+ 5
the list comprehension mentioned by Tibor Santa is a good idea. instead of the formula that is currently used, we can also use the *math.dist()* mehod that was added in python 3.8: from math import dist print(min([dist((0,0), point) for point in points])) [edited]: or using a generator expression: from math import dist print(min(dist((0, 0), point) for point in points))
22nd Apr 2023, 8:18 PM
Lothar
Lothar - avatar
+ 4
distance should be initialized with zeros , instead 0,1,2,3 ... distance = len(points)*[0] if index is used in loop, better do it with enumerate: for z, (x,y) in enumerate (points): distance[z] = math.sqrt((x**2) + (y**2))
21st Apr 2023, 7:47 PM
tamaslud
tamaslud - avatar