Modifying the axis ticks from words to lines

[ranbarr]

Hi,
Im trying to modify the yticks at my heat map from words to lines.
thats my code:

with open('heat1.csv', 'r', encoding='mac_roman', newline='') as csvfile:
    df = pd.read_csv(csvfile, sep=',')
    df['id'] = df['id'].apply(lambda x: x[:-2])
    df = df.fillna(0)   
    grpby = df.groupby('id', as_index=True).mean()
    plt.subplots(figsize = (250,100))
    sns.set(font_scale=7.5)
    sns.heatmap(grpby, cmap='coolwarm', vmin = 0, center = 750000 , vmax=2000000)
    plt.ylabel('')
    plt.show()

this is my heatmap:
https://ibb.co/L5JnHHj

And I want to ticks to look like this:
https://ibb.co/sm8hJ47