DataFrame中去除指定列为空的行方法

# encoding: utf-8
import pandas as pd
import math
import numpy as np
data = pd.read_csv('mydata.csv')
print len(data)
for i in range(len(data)):
  if (data['导演'][i] == ‘'):
    data = data.drop(i)
data.to_csv('data.csv')

# encoding: utf-8
import pandas as pd
import math
import numpy as np
data = pd.read_csv('mydata.csv')
print len(data)
for i in range(len(data)):
  if np.isnan(data['导演'][i]):
    data = data.drop(i)
data.to_csv('data.csv')