plt.subplot 中的 n += 1 是什么意思

Question

I don't understand how the n +=1 variable below made the distplot visualization into 3 columns

n=0
for x in ['Age', 'Annual Income (k$)', 'Spending Score (1-100)']:
    n +=1
    plt.subplot(1,3,n)
    plt.subplots_adjust(hspace=0.5,wspace = 0.5)
    sns.distplot(df[x], bins = 20)
    plt.title('Displot of {}'.format(x))
plt.show()

pls see attached photo of distplot enter image description here

Answer 1

The third parameter of plt.subplot represents the index. This may be helpful to you: https://matplotlib.org/3.3.0/api/_as_gen/matplotlib.pyplot.subplot.html

"The position of the subplot described by one of

Three integers (nrows, ncols, index). The subplot will take the index position on a grid with nrows rows and ncols columns. index starts at 1 in the upper left corner and increases to the right. index can also be a two-tuple specifying the (first, last) indices (1-based, and including last) of the subplot, eg, fig.add_subplot(3, 1, (1, 2)) makes a subplot that spans the upper 2/3 of the figure.

A 3-digit integer. The digits are interpreted as if given separately as three single-digit integers, ie fig.add_subplot(235) is the same as fig.add_subplot(2, 3, 5). Note that this can only be used if there are no more than 9 subplots."