File Python, using pandas to save the data as csv format

When using pandas to save data can be saved in two forms

 

 

　　First, the amount of data is not very large files, can be placed in the list, a one-time storage.

　　Second, for large amounts of data, consider generation side, while storing, avoid open up a lot of memory space to store data destined for the list.

I Caishuxueqian, only know some of the surface of things, if wrong, please correct me hope!

 

Is illustrated by the following codes

. 1  Import PANDAS AS PD
 2  
. 3  
. 4  class SaveCsv:
 . 5  
. 6      DEF  the __init__ (Self):
 . 7          self.clist = [[l, 2,3], [4,5,6], [7,8,9 ]]
 . 8  
. 9      DEF saveFile (Self, my_list):
 10          "" " 
. 11          the documents saved as csv file format, header write column name, index name write line
 12 is          : param my_list: a list of data to be stored
 13 is          : return:
 14          "" " 
15          DF = pd.DataFrame (Data = [my_list])
 16          df.to_csv ( " ./Test.csv " , encoding ="utf-8-sig", mode="a", header=False, index=False)
17 
18     def saveAll(self):
19         """
20         一次性存储完
21         :return:
22         """
23         pf = pd.DataFrame(data=self.clist)
24         pf.to_csv("./Test_1.csv", encoding="utf-8-sig", header=False, index=False)
25 
26 
27     def main(self):
28         nameList = ["Beijing " , " Shanghai " , " Guangzhou " , " Shenzhen " , " xiongan " , " MAGAZINE " ]
 29          # Start represents the cycle starts counting at 
30          for NUM, Data in the enumerate (nameList, Start = 1 ):
 31 is              IF NUM == 2% 0:
 32                  self.savefile ([ " success " , Data, NUM])
 33 is              the else :
 34 is                 self.savefile(["失败", data, num])
35         return 0
36 
37 if __name__ == '__main__':
38     sc = SaveCsv()
39     sc.main()
40     sc.saveAll()

 

The following code is briefly described:

savefile: can be saved while circulating through to the same file, the meanings of some parameters can be self Baidu

saveAll: through a one-time storage, all data stored by the end of the list once