Insert String in Python SQLite Statement -

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I am trying to insert a string into a SQLite selection statement in Python. When I try this code: 

  cur.execute ("SELECT * FROM DB where employee name = '?'", (EmpNum,))   
  I get this error:   
  sqlite3. Programming Error: Supply of wrong number of binary. Current statement uses 0, and 1 is supplied there.   
  When I try this code:   
  cur.execute ("SELECT * FROM DB where employee Num = '", I get this error:  
  Type error: the function takes up to 2 arguments (3 given)      
 Code>  
 How do I ask this string? Sorry I'm new to Python Any help would be appreciated!   "post-text" itemprop = "text"> 
 The string with commas only works with  print <> . Instead try this:  
  cur.execute ("select * FROM DB where employee name = '" + empNum + "'")

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