How to get the numbers of data row from sqlite3 database in python -

I'm trying to get the number of rows returned from a sqlite3 database in Python, but it seems that The feature is not available:

php mysqli_num_rows () in mysql

Think of it, though I have prepared a tool but it is a strange one: executing a class, execute sql and give me the result:

  # of results Conclusions G data = sql.sqlExec ("Choose from user") # Run another query for the number of checks, do not have very good working data copy = sql.sqlExec ("select from user") # insert data Try copy and get the length, I did this because I soon inform # as I execute any work of data, the data becomes zero # It is not very good because someone else Can another transaction on the database if the nick of time # len (list (Detacopi)): The data for m: print ( "Name = {}; Password = {}". Format (m ["username"], me ["password"])); Other: Print ("Query Return Nothing")   
 Is there a function or property that can do without stress?   
 
 
  Normally , returns the number of results for a query.  
 However, for SQLite, that property is often set to -1 due to the nature due to the SQLite results a  COUNT ()  query  first  you will not often know the number of results.  
 The reason for this is that SQLite produces rows because it finds them in the database, and  themselves  will not know how many rows are created until the database is finished Happens.  
  cursor.rowcount :  
 
 Although this code applies to the  cursor  class  module Supports the database engine itself, for the determination of one row, the / / rows were selected for Quirky.  
  For the execution ()  statement, the number of modifications is expressed in  rowcount .  
 As required is the Python DB API device,  rowcount  attribute â "-1 if any  executeXX ()  cursor or line number of last operation But the interface is not set by ??  contains the  SELECT  statement because we can not set the number of rows until all the rows are received.  < / P>  
 Emphasis mine.  
 For your specific query, You can add a sub-selection to add:  
  data = sql.sqlExec ("select (select count from user)"   
 This large For tables not all are efficient, however.  
 If you only need all  one  line,  cursor.fetchone ()  instead: < / P> 
  Use cursor. Execute ('Where is the user used?', (Userid,)) Line = cursor .fetchone () If the line is none: Increase valueError ('such No users Interpretation ") result =" Name = {}; Password = {} ". Format (line ["user name"], line ["password"])