Storing a text file into SQLite3 database using python

Question

I have done some operations with a file using python. Now all i have to is to create one table with two columns...one is for msgid and another is for msgstr...all msgid s should be stored in msgid column and all msgstr s should be stored in msgstr column..

I am very new to the programming world. Kindly help me. I have pasted what i had done below:

fn='ru.po'
f=open(fn)
output=[]
for line in f:
    if not '#' in line:
        output.append(line)
f.close()
f=open(fn,'w')
f.writelines(output)
f.close

Answer 1

There are 2 parts to this:

1. Extracting the msgid and corresponding msgstr values from the .po file.
2. Inserting the msgid and msgstr into a table in the SQLite database.

For part 1, I suggest using the babel module. You can install it with

pip install babel

Use the babel.messages.pofile.read_po() function to read the .po file. This will return a catalog on which you can iterate over all of the messages parsed from the file:

from babel.messages.pofile import read_po

with open('ru.po') as po_file:
    cat = read_po(po_file)

for message in cat:
    if message.id:
        print '{!r} -> {!r}'.format(message.id, message.string)

---

For part 2:

import sqlite3

conn = sqlite3.connect('catalog.db')
cursor = conn.cursor()
result = cursor.execute('CREATE TABLE ru (msgid TEXT, msgstr TEXT)')

# bulk insert the messages
messages = [(msg.id, msg.string) for msg in cat if msg.id]
result = cursor.executemany('INSERT INTO ru (msgid, msgstr) VALUES (?, ?)',  messages)
assert(result.rowcount == len(messages))
conn.commit()

result = cursor.execute("SELECT * from ru where msgid = '11 inches/sec.'")
msgid, msgstr = result.fetchone()
# .encode('utf8') can be removed for Python 3
print '"{}" translates to "{}"'.format(msgid, msgstr.encode('utf8'))

msgid = 'A Samba password is required to export printer drivers'
result = cursor.execute("SELECT * from ru where msgid = ?", (msgid,))
msgid, msgstr = result.fetchone()
print '"{}" translates to "{}"'.format(msgid, msgstr.encode('utf8'))

Output

"11 inches/sec." translates to "11 дюймов/с"
"A Samba password is required to export printer drivers" translates to "Для экспорта драйверов принтера требуется пароль Samba"

You might notice that there are lot of msgid s with empty msgstr s. If you don't want them, then modify

messages = [(msg.id, msg.string) for msg in cat if msg.id]

to

messages = [(msg.id, msg.string) for msg in cat if msg.id and msg.string]