Same scale for x and y axis

I am using plotly for python and I can't set x and y axis so they could have the same scale:

Here is my layout:

layout = Layout(
    xaxis=XAxis(
        range=[-150, 150],
        showgrid=True,
        zeroline=True,
        showline=True,
        gridcolor='#bdbdbd',
        gridwidth=2,
        zerolinecolor='#969696',
        zerolinewidth=4,
        linecolor='#636363',
        linewidth=6
    ),
    yaxis=YAxis(
        range=[-150,150],
        showgrid=True,
        zeroline=True,
        showline=True,
        gridcolor='#bdbdbd',
        gridwidth=2,
        zerolinecolor='#969696',
        zerolinewidth=4,
        linecolor='#636363',
        linewidth=6
    )
)

And then I get something like this!

enter image description here

Why is the scale is different for x and y? that will affect my visualization.

How can I get a grid with a square cells?

Solution

You can assign same length for height and width in your layout. Here is an example:

layout = Layout(
    xaxis=XAxis(
       range=[-150, 150],
       showgrid=True,
       zeroline=True,
       showline=True,
       gridcolor='#bdbdbd',
       gridwidth=2,
       zerolinecolor='#969696',
       zerolinewidth=4,
       linecolor='#636363',
       linewidth=6
    ),
    yaxis=YAxis(
        range=[-150,150],
        showgrid=True,
        zeroline=True,
        showline=True,
        gridcolor='#bdbdbd',
        gridwidth=2,
        zerolinecolor='#969696',
        zerolinewidth=4,
        linecolor='#636363',
        linewidth=6
   ),
   height=600,
   width=600,
)