合并文件

def merge_file(result_dict):
    
    if not isinstance(result_dict,dict):
        raise ValueError('input parameter must dict!')
    
    if len(result_dict) <= 1:
        raise ValueError('{} can not be None and at least 2 dataframe!'.format(result_dict))

    if not all('account_id' in result_dict.get(file).columns for file in result_dict.keys()):
        raise ValueError("info for {} ,['account_id'] must be as a column of all files .".format(result_dict))
    
    df = []
    for k in result_dict:
        tmp = result_dict.get(k).set_index('account_id')
        df.append(tmp)
    
    import functools
    
    df_merge = functools.reduce(lambda left,right: 
                                pd.merge(left,right,right_index=True,left_index=True,how='left'),df
                                )
        
    df_merge.reset_index(inplace=True)
    
    print(df_merge.info())
    
    return df_merge