I'm trying to make visualization of data using pandas. Here is my code where plt is Matplotlib.

```
meets = results.groupby(['Meet']).size()
meets.dropna()
plt.figure(figsize=(14,14))
meets.plot(kind='pie',autopct='%.2f',fontsize=20,title='Причина знакомства с Доктором',legend=True,labels=None)
plt.show()

```

With this code i get this pie chart with none label. 
[![enter image description here](https://i.stack.imgur.com/G8ILe.png)](https://i.stack.imgur.com/G8ILe.png)
How to remove this label?