cx_Oracle SELECT statement with WHERE clause and single quote

import cx_Oracle

dsn_tns = cx_Oracle.makedsn('**********', '*******', service_name='***') 

conn = cx_Oracle.connect(user='******', password='*******', dsn=dsn_tns)

c = conn.cursor()
c.execute('select username,created from dba_users where username='USERNAME' ')
for row in c:
    print (row[0], '-', row[1]) # this only shows the first two columns. To add an additional column you'll need to add , '-', row[2], etc.
conn.close()

  File "*******************", line 9
    c.execute('select username,created from dba_users where username='MONITOR' ')
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: invalid syntax. Perhaps you forgot a comma?

WHat is wrong here , when I using single quote around username then I am getting this error .

Answer

c.execute(
    """select username, created from dba_users where username=:USERNAME""", 
    USERNAME = 'Cristiano Ronaldo'
)