Why does my variable's value is changed by a line that doens't touch it in Python? -

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this question has answer here:

the answer question seems pretty straightforward : can't doesn't. yet believe happening me , driving me crazy. therefore appreciate opinion.

here's situation. i'm writing script has following function in :

    def reducereferencecode():          code = referencecode          if e == 7:             critlimit = 2         elif e == 4:             critlimit = 1          if d < critlimit:             in [4, 5, 6]:                 if code[i] >= critlimit:                     print referencecode                     code[i] = code[i] - critlimit                     print referencecode                     break         else:             code[7] = code[7] - critlimit         code[9] = 1          return code

the value of referencecode variable - passed argument program sys.argv - changed between 2 print commands. main function prints both referencecode , reduced code comparison purposes, value stored in code

here's program's output:

    [1, 4, 3, 4, 9, 7, 2, 0, 6, 7, 9, 2]     [1, 4, 3, 4, 7, 7, 2, 0, 6, 7, 9, 2]     reference code [1, 4, 3, 4, 7, 7, 2, 0, 6, 1, 9, 2] , reduced reference code [1, 4, 3, 4, 7, 7, 2, 0, 6, 1, 9, 2]

both variables should not have same value , don't see why operation on code[i] affecting referencecode's value.

any insight highly appreciated :-)

the value of referencecode list. list has reference called code. updating list either of these references changes one-any-only list object. fix copy list

code = referencecode[:]

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