x=0v=1matchv:case1:ifx<0:x=1case2:ifx<0:x=1x+=1

   0          0       RESUME                   0   1          2       LOAD_CONST               0 (0)              4       STORE_NAME               0 (x)   2          6       LOAD_CONST               1 (1)              8       STORE_NAME               1 (v)   3         10       LOAD_NAME                1 (v)   4         12       COPY                     1             14       LOAD_CONST               1 (1)             16       COMPARE_OP              88 (bool(==))             20       POP_JUMP_IF_FALSE       12 (to L2)             24       NOT_TAKEN             26       POP_TOP   5         28       LOAD_NAME                0 (x)             30       LOAD_CONST               0 (0)             32       COMPARE_OP              18 (bool(<))             36       POP_JUMP_IF_FALSE        3 (to L1)             40       NOT_TAKEN   6         42       LOAD_CONST               1 (1)             44       STORE_NAME               0 (x)  --   L1:   46       JUMP_FORWARD            15 (to L3)   7   L2:   48       LOAD_CONST               2 (2)             50       COMPARE_OP              88 (bool(==))             54       POP_JUMP_IF_FALSE       10 (to L3)             58       NOT_TAKEN   8         60       LOAD_NAME                0 (x)             62       LOAD_CONST               0 (0)             64       COMPARE_OP              18 (bool(<))             68       POP_JUMP_IF_FALSE        3 (to L3)             72       NOT_TAKEN   9         74       LOAD_CONST               1 (1)             76       STORE_NAME               0 (x)  10   L3:   78       LOAD_NAME                0 (x)             80       LOAD_CONST               1 (1)             82       BINARY_OP               13 (+=)             86       STORE_NAME               0 (x)             88       RETURN_CONST             3 (None)'<module>' branches:    ex9.py 4:9-4:10 "1" (<module>@20) -> 4:9-4:10 "1" (<module>@26) [case -> out]    ex9.py 4:9-4:10 "1" (<module>@20) -> 7:9-7:10 "2" (<module>@48) [case -> next case]    ex9.py 5:11-5:16 "x < 0" (<module>@36) -> 6:16-6:17 "1" (<module>@42) [if/while -> block]    ex9.py 5:11-5:16 "x < 0" (<module>@36) -> (start_line=None) (<module>@46) [(dst.start_line=None)]    ex9.py 7:9-7:10 "2" (<module>@54) -> 8:11-8:12 "x" (<module>@60) [case -> body]    ex9.py 7:9-7:10 "2" (<module>@54) -> 10:0-10:1 "x" (<module>@78) [case -> next stmt]    ex9.py 8:11-8:16 "x < 0" (<module>@68) -> 9:16-9:17 "1" (<module>@74) [if/while -> block]    ex9.py 8:11-8:16 "x < 0" (<module>@68) -> 10:0-10:1 "x" (<module>@78) [if/while -> next stmt]