two list save in db in python code example
Example 1: python write a list to a file line by line
f = open("Bills.txt", "w")
f.write("\n".join(map(lambda x: str(x), bill_List)))
f.close()
f = open('Bills.txt', 'w')
for item in bill_List:
f.write("%s\n" % item)
f.close()
with open('Bills.txt', 'w') as f:
for s in bill_List:
f.write(s + '\n')
with open('Bills.txt', 'r') as f:
bill_List = [line.rstrip('\n') for line in f]
with open('Bills.txt', 'w') as out_file:
out_file.write('\n'.join(
bill_List))
Example 2: array storing in file by python
import numpy as np
import csv
arr1 = [i for i in range(500)]
arr2 = [i for i in range(1000)]
arr3 = [i for i in range(2000)]
with open('record.csv', 'a') as record_append:
np.savetxt(record_append, np.asarray([arr1]), delimiter=',')
np.savetxt(record_append, np.asarray([arr2]), delimiter=',')
np.savetxt(record_append, np.asarray([arr3]), delimiter=',')
two_dim_arr = []
with open('record.csv', 'r') as record_read:
reader = csv.reader(record_read)
for i, each_arr in enumerate(reader):
two_dim_arr.append([eval(each) for each in each_arr])
for each_line in two_dim_arr:
print(each_line)