### Question :

How do I find the distance between two points? [closed]

Let’s say I have x1, y1 and also x2, y2.

How can I find the distance between them?

It’s a simple math function, but is there a snippet of this online?

##
Answer #1:

```
dist = sqrt( (x2 - x1)**2 + (y2 - y1)**2 )
```

As others have pointed out, you can also use the equivalent built-in `math.hypot()`

:

```
dist = math.hypot(x2 - x1, y2 - y1)
```

##
Answer #2:

Let’s not forget math.hypot:

```
dist = math.hypot(x2-x1, y2-y1)
```

Here’s hypot as part of a snippet to compute the length of a path defined by a list of (x, y) tuples:

```
from math import hypot
pts = [
(10,10),
(10,11),
(20,11),
(20,10),
(10,10),
]
# Py2 syntax - no longer allowed in Py3
# ptdiff = lambda (p1,p2): (p1[0]-p2[0], p1[1]-p2[1])
ptdiff = lambda p1, p2: (p1[0]-p2[0], p1[1]-p2[1])
diffs = (ptdiff(p1, p2) for p1, p2 in zip (pts, pts[1:]))
path = sum(hypot(*d) for d in diffs)
print(path)
```

##
Answer #3:

It is an implementation of Pythagorean theorem. Link: http://en.wikipedia.org/wiki/Pythagorean_theorem