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  1. N = 20
  2. S = " " * N
  3. for i in range(N):
  4. S = S[1:] + "X"
  5. print(S)
Success #stdin #stdout 0.02s 9984KB
stdin
Standard input is empty
stdout
                   X
                  XX
                 XXX
                XXXX
               XXXXX
              XXXXXX
             XXXXXXX
            XXXXXXXX
           XXXXXXXXX
          XXXXXXXXXX
         XXXXXXXXXXX
        XXXXXXXXXXXX
       XXXXXXXXXXXXX
      XXXXXXXXXXXXXX
     XXXXXXXXXXXXXXX
    XXXXXXXXXXXXXXXX
   XXXXXXXXXXXXXXXXX
  XXXXXXXXXXXXXXXXXX
 XXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXX