matplotlib.axes.Axes.step

Axes.step(self, x, y, *args, where='pre', data=None, **kwargs)
[source]

Make a step plot.
Call signatures:
step(x, y, [fmt], *, data=None, where='pre', **kwargs)
step(x, y, [fmt], x2, y2, [fmt2], ..., *, where='pre', **kwargs)
This is just a thin wrapper around plot
which changes some formatting options. Most of the concepts and parameters of plot can be used here as well.
Parameters: 

x : array_like 
1D sequence of x positions. It is assumed, but not checked, that it is uniformly increasing. 
y : array_like 
1D sequence of y levels. 
fmt : str, optional 
A format string, e.g. 'g' for a green line. See plot for a more detailed description. Note: While full format strings are accepted, it is recommended to only specify the color. Line styles are currently ignored (use the keyword argument linestyle instead). Markers are accepted and plotted on the given positions, however, this is a rarely needed feature for step plots. 
data : indexable object, optional 
An object with labelled data. If given, provide the label names to plot in x and y. 
where : {'pre', 'post', 'mid'}, optional, default 'pre' 
Define where the steps should be placed:  'pre': The y value is continued constantly to the left from every x position, i.e. the interval
(x[i1], x[i]] has the value y[i] .  'post': The y value is continued constantly to the right from every x position, i.e. the interval
[x[i], x[i+1]) has the value y[i] .  'mid': Steps occur halfway between the x positions.

Returns: 
 lines

A list of Line2D objects representing the plotted data. 
Other Parameters: 
 **kwargs

Additional parameters are the same as those for plot . 
Notes
Examples using matplotlib.axes.Axes.step