# Fix Python – Plotting a list of (x, y) coordinates in matplotlib

## Question

I have a list of pairs `(a, b)` that I would like to plot with `matplotlib` in python as actual x-y coordinates. Currently, it is making two plots, where the index of the list gives the x-coordinate, and the first plot’s y values are the `a`s in the pairs and the second plot’s y values are the `b`s in the pairs.

To clarify, my data looks like this: `li = [(a,b), (c,d), ... , (t, u)]`
I want to do a one-liner that just calls `plt.plot()` incorrect.
If I didn’t require a one-liner I could trivially do:

``````xs = [x for x in li]
ys = [x for x in li]
plt.plot(xs, ys)
``````

How can I get matplotlib to plot these pairs as x-y coordinates?

## Sample data

``````# sample data
li = list(zip(range(1, 14), range(14, 27)))

li → [(1, 14), (2, 15), (3, 16), (4, 17), (5, 18), (6, 19), (7, 20), (8, 21), (9, 22), (10, 23), (11, 24), (12, 25), (13, 26)]
``````

## Incorrect Plot

``````plt.plot(li)
plt.title('Incorrect Plot:\nEach index of the tuple plotted as separate lines')
`````` ## Desired Plot

• This produces the correct plot, but to many lines of code are used to unpack `li`. I need to unpack and plot with a single line of code, not multiple list-comprehensions.
``````xs = [x for x in li]
ys = [x for x in li]
plt.plot(xs, ys)
plt.title('Correct Plot:\nBut uses to many lines to unpack li')
`````` Now we will see solution for issue: Plotting a list of (x, y) coordinates in matplotlib

Given `li` in the question:

``````li = list(zip(range(1, 14), range(14, 27)))
``````

To unpack the data from pairs into lists use `zip`:

``````x, y = zip(*li)

x → (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
y → (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
``````

The one-liner uses the unpacking operator (*), to unpack the list of tuples for `zip`, and unpacks the `zip` object into the plot API.

``````plt.scatter(*zip(*li))
`````` ``````plt.plot(*zip(*li))
`````` This question is answered By – sashkello