python csv换行

Question

iam using this code to convert db table to csv file, it is converting in to csv but instead of new line / line breck its using double quotes , can someone help me

import MySQLdb
import csv
conn = MySQLdb.connect(user='root',  db='users', host='localhost')
cursor = conn.cursor()
cursor.execute('SELECT * FROM users.newusers')
ver = cursor.fetchall()
ver1 = []
for ve in ver:
    ve = str(ve).replace("', '","|").replace(", '","|").replace(","," ").replace("  "," ").replace("|",",")
    ver1.append(ve)
print ver1
csv_file = open('filename', 'wb')
writer = csv.writer(csv_file)
writer.writerow(ver1)       csv_file.close()                                                                                

current output

"(114L,New,9180971675,Ravi Raju,RAJRAVI,National,#N.A,No,No,No,#N.A,OS40,005056BB0803,192.168.0.1,no,yes')","(115L,New,9180971676,Rajendran Mohan,rajemoh,National,#N.A,No,No,No,#N.A,OS40,005056BB0803,192.168.10.10,no,yes')"

expected out

 114L,New,9180971675,Ravi Raju,RAJRAVI,National,#N.A,No,No,No,#N.A,OS40,005056BB0803,192.168.0.1,no,yes


 115L,New,9180971676,Rajendran Mohan,rajemoh,National,#N.A,No,No,No,#N.A,OS40,005056BB0803,192.168.10.10,no,yes

Answer 1

SQL queries will return results to you in a list of tuples from fetchall() . In your current approach, you iterate through this list but call str() on each tuple, thereby converting the whole tuple to its string representation.

Instead, you could use a list comprehension on each tuple both to get it into a nested list format and apply your replace() operations.

for ve in ver:
    ver1.append([str(item).replace(<something>) for item in ve])

In the final step you use csv.writerow() which is designed to be used within a for loop. If your list is nested in the form [[row1], [row2]] then you can just change this to writerow s . Also, it's best practice to use the context manager with to handle files as this will automatically close the file once the operation is completed.

with open('filename.csv', 'wb') as csv_file:
     writer = csv.writer(csv_file)
     writer.writerows(ver1)