matplotlib.pyplot导入但未使用

Question

我认为这是一个缩进错误，但对于我的生活，我无法弄清楚我哪里出错了。希望得到一些帮助

def read_csv(filename):

    with open(filename) as f:
        reader = csv.reader(f)
        next(reader)

        rain = []
        highest_correlated = []
        for row in reader:
            rain.append(float(row[1]))
            highest_correlated.append(float(row[2]))

    return rain, highest_correlated

import matplotlib.pyplot as plt
import csv

if __name__ == '__main__':
    rain, highest_correlated = read_csv('correlaterain.csv')
    corr = find_corr_x_y(rain, highest_correlated)
print('Highest correlation: {0}'.format(corr))
scatter_plot(rain, highest_correlated)