Python casting int("string", integer) -


what logic behind

     int("string", integer)

for example:

     int("220", 3)

yields 

      24

the optional integer numeric base use in converting string (defaults base 10).

220 base 3 = 2 * (3**2) + 2 * (3**1) + 0 * (3**0)            = 2*9 + 2*3 + 0*1            = 18 + 6 + 0            = 24

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