bpo-43396: Normalise naming in sqlite3 doc examples (pythonGH-24746)

(cherry picked from commit 40d1b83)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>

Doc/library/sqlite3.rst

@@ -25,34 +25,34 @@ represents the database. Here the data will be stored in the
 :file:`example.db` file::
 
  import sqlite3
- conn = sqlite3.connect('example.db')
+ con = sqlite3.connect('example.db')
 
 You can also supply the special name ``:memory:`` to create a database in RAM.
 
 Once you have a :class:`Connection`, you can create a :class:`Cursor` object
 and call its :meth:`~Cursor.execute` method to perform SQL commands::
 
- c = conn.cursor()
+ cur = con.cursor()
 
  # Create table
- c.execute('''CREATE TABLE stocks
- (date text, trans text, symbol text, qty real, price real)''')
+ cur.execute('''CREATE TABLE stocks
+  (date text, trans text, symbol text, qty real, price real)''')
 
  # Insert a row of data
- c.execute("INSERT INTO stocks VALUES ('2006-01-05','BUY','RHAT',100,35.14)")
+ cur.execute("INSERT INTO stocks VALUES ('2006-01-05','BUY','RHAT',100,35.14)")
 
  # Save (commit) the changes
- conn.commit()
+ con.commit()
 
  # We can also close the connection if we are done with it.
  # Just be sure any changes have been committed or they will be lost.
- conn.close()
+ con.close()
 
 The data you've saved is persistent and is available in subsequent sessions::
 
  import sqlite3
- conn = sqlite3.connect('example.db')
- c = conn.cursor()
+ con = sqlite3.connect('example.db')
+ cur = con.cursor()
 
 Usually your SQL operations will need to use values from Python variables. You
 shouldn't assemble your query using Python's string operations because doing so
@@ -67,19 +67,19 @@ example::
 
  # Never do this -- insecure!
  symbol = 'RHAT'
- c.execute("SELECT * FROM stocks WHERE symbol = '%s'" % symbol)
+ cur.execute("SELECT * FROM stocks WHERE symbol = '%s'" % symbol)
 
  # Do this instead
  t = ('RHAT',)
- c.execute('SELECT * FROM stocks WHERE symbol=?', t)
- print(c.fetchone())
+ cur.execute('SELECT * FROM stocks WHERE symbol=?', t)
+ print(cur.fetchone())
 
  # Larger example that inserts many records at a time
  purchases = [('2006-03-28', 'BUY', 'IBM', 1000, 45.00),
  ('2006-04-05', 'BUY', 'MSFT', 1000, 72.00),
  ('2006-04-06', 'SELL', 'IBM', 500, 53.00),
  ]
- c.executemany('INSERT INTO stocks VALUES (?,?,?,?,?)', purchases)
+ cur.executemany('INSERT INTO stocks VALUES (?,?,?,?,?)', purchases)
 
 To retrieve data after executing a SELECT statement, you can either treat the
 cursor as an :term:`iterator`, call the cursor's :meth:`~Cursor.fetchone` method to
@@ -88,7 +88,7 @@ matching rows.
 
 This example uses the iterator form::
 
- >>> for row in c.execute('SELECT * FROM stocks ORDER BY price'):
+ >>> for row in cur.execute('SELECT * FROM stocks ORDER BY price'):
  print(row)
 
  ('2006-01-05', 'BUY', 'RHAT', 100, 35.14)
@@ -768,23 +768,23 @@ Row Objects
 
 Let's assume we initialize a table as in the example given above::
 
- conn = sqlite3.connect(":memory:")
- c = conn.cursor()
- c.execute('''create table stocks
+ con = sqlite3.connect(":memory:")
+ cur = con.cursor()
+ cur.execute('''create table stocks
  (date text, trans text, symbol text,
  qty real, price real)''')
- c.execute("""insert into stocks
- values ('2006-01-05','BUY','RHAT',100,35.14)""")
- conn.commit()
- c.close()
+ cur.execute("""insert into stocks
+  values ('2006-01-05','BUY','RHAT',100,35.14)""")
+ con.commit()
+ cur.close()
 
 Now we plug :class:`Row` in::
 
- >>> conn.row_factory = sqlite3.Row
- >>> c = conn.cursor()
- >>> c.execute('select * from stocks')
+ >>> con.row_factory = sqlite3.Row
+ >>> cur = con.cursor()
+ >>> cur.execute('select * from stocks')
  <sqlite3.Cursor object at 0x7f4e7dd8fa80>
- >>> r = c.fetchone()
+ >>> r = cur.fetchone()
  >>> type(r)
  <class 'sqlite3.Row'>
  >>> tuple(r)