seasonal_trend

beijing_popularity_month = beijing_popularity.groupBy(f.month(beijing_popularity["date"]).alias("month")).count().sort("month", ascending=True)
beijing_popularity_month_pd = beijing_popularity_month.toPandas()
num = len(beijing_popularity_month_pd)*4
c = [i for i in range(0,num,4)]
plt.figure(figsize=(10,4))
plt.bar(c, beijing_popularity_month_pd['count'],width=3, align='center', alpha=0.5)
plt.xticks(c,beijing_popularity_month_pd["month"])
plt.ylabel('Popularity')
plt.xlabel('Month')
plt.title('The Popularity of Beijing by month')
plt.show()