Python for 循环

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[JiaxiangBU]

fold = 0
for train_index, test_index in time_kfold.split(train):
    cv_train, cv_test = train.iloc[train_index], train.iloc[test_index]
    
    print('Fold :', fold)
    print('Train date range: from {} to {}'.format(cv_train.date.min(), cv_train.date.max()))
    print('Test date range: from {} to {}\n'.format(cv_test.date.min(), cv_test.date.max()))
    fold += 1

[JiaxiangBU]

def foo():
    cv_train, cv_test = train.iloc[train_index], train.iloc[test_index]
    
    print('Fold :', fold)
    print('Train date range: from {} to {}'.format(cv_train.date.min(), cv_train.date.max()))
    print('Test date range: from {} to {}\n'.format(cv_test.date.min(), cv_test.date.max()))
    fold += 1

[JiaxiangBU]

[foo() for a, b in xxx]

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(a,b).apply()

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mean(df)

df$a

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for (..) :
  mean(i)

[JiaxiangBU]

iter