pandas 获取Dataframe 的列名

train = pd.read_csv('D:\\data\\titanic\\train.csv')
print(train.columns.values)
# ['PassengerId' 'Survived' 'Pclass' 'Name' 'Sex' 'Age' 'SibSp' 'Parch'
#  'Ticket' 'Fare' 'Cabin' 'Embarked']