Команда exec () работает в простом коде, но не в методе

Question

Может ли кто-нибудь объяснить мне, почему exec () прекрасно работает при вызове вне метода, но внутри метода возникает следующая ошибка?

UnboundLocalError: local variable 'connectivities' referenced before assignment

Это пример кода:

#!/usr/bin/env python

CON_FILE = "sample_input.txt"


import re
AAIG_connectivities_dict = {}
with open(CON_FILE, 'r') as f:
    for line in f:
        m = re.search("^([A-Za-z0-9]+N[DE12X]*H[DE12X]*)\s+(\(.*)$", line)
        if m:
            i_AAIG_name = m.group(1)
            s = "connectivities = " + m.group(2) + ","  ; # comma to support the single connectivities, too.
            exec(s)
            connectivities = list(connectivities)
            AAIG_connectivities_dict[i_AAIG_name] = connectivities
print(AAIG_connectivities_dict)


def load_connectivities_from_file(CON_FILE):
    import re
    AAIG_connectivities_dict = {}
    with open(CON_FILE, 'r') as f:
        for line in f:
            m = re.search("^([A-Za-z0-9]+N[DE12X]*H[DE12X]*)\s+(\(.*)$", line)
            if m:
                i_AAIG_name = m.group(1)
                s = "connectivities = " + m.group(2) + ","  ; # comma to support the single connectivities, too.
                exec(s)
                connectivities = list(connectivities)
                AAIG_connectivities_dict[i_AAIG_name] = connectivities
    print(AAIG_connectivities_dict)

load_connectivities_from_file(CON_FILE)

Чтобы создать «sample_input.txt», выполните в оболочке BASH:

cat > sample_input.txt << EOF
i    possible i-1
X10NXHX    ('X8NXHX', 2, 3, 1.0, 0.29096014803723164), ('X15NXHX', 1, 3, 0.5075369033220299, 0.017894454516959042), ('X62NXHX', 1, 3, 0.2811455233433974, 0.009912472860959547), ('X9NXHX', 1, 3, 0.12840435222669283, 0.004527209402233843), ('X29NXHX', 1, 3, 0.10270495431102347, 0.003621114290518612), ('X13NXHX', 1, 3, 0.08843022425103912, 0.0031178237787778664), ('X27NXHX', 1, 3, 0.06967097761433207, 0.0024564206699284994), ('X61NXHX', 1, 3, 0.05203985561001743, 0.001834792353398024)
X12NXHX    ('X11NXHX', 1, 4, 1.0, 0.014683671473740228), ('X32NXHX', 1, 4, 0.4498988189862975, 0.006606166454418515), ('X31NXHX', 1, 4, 0.1633848174540025, 0.0023990889832915907), ('X36NXHX', 1, 4, 0.08439509702204087, 0.0012392298786660803), ('X13NXHX', 1, 4, 0.049958867050537537, 0.0007335795909703586), ('X30NXHX', 1, 4, 0.02502771889502097, 0.00036749880199160877), ('X38NXHX', 1, 4, 0.02304040021466484, 0.00033831766737563233), ('X40NXHX', 1, 4, 0.01903733838008644, 0.00027953802250761526), ('X29NXHX', 1, 4, 0.01757512963793901, 0.00025806742971189146), ('X5NXHX', 1, 4, 0.01709261655271193, 0.0002509823660866362), ('X39NXHX', 1, 4, 0.007533665145110988, 0.00011062186398397724), ('X33NXHX', 1, 4, 0.005975869974827519, 8.774771148015558e-05), ('X41NXHX', 1, 4, 0.00046841775328956294, 6.878092401771443e-06), ('X55NXHX', 1, 4, 0.00035046651402599333, 5.146135154504658e-06), ('X35NXHX', 1, 4, 8.313139742956269e-05, 1.2206741290086314e-06)
EOF

Answer 1

Я нашел решение. В Python 3 вы должны использовать новое пустое пространство имен в exec (). Поэтому код должен выглядеть следующим образом:

#!/usr/bin/env python

CON_FILE = "sample_input.txt"


import re
AAIG_connectivities_dict = {}
with open(CON_FILE, 'r') as f:
    for line in f:
        m = re.search("^([A-Za-z0-9]+N[DE12X]*H[DE12X]*)\s+(\(.*)$", line)
        if m:
            i_AAIG_name = m.group(1)
            s = "connectivities = " + m.group(2) + ","  ; # comma to support the single connectivities, too.
            exec(s)
            connectivities = list(connectivities)
            AAIG_connectivities_dict[i_AAIG_name] = connectivities
print(AAIG_connectivities_dict)


def load_connectivities_from_file(CON_FILE):
    import re
    AAIG_connectivities_dict = {}
    with open(CON_FILE, 'r') as f:
        for line in f:
            m = re.search("^([A-Za-z0-9]+N[DE12X]*H[DE12X]*)\s+(\(.*)$", line)
            if m:
                i_AAIG_name = m.group(1)
                s = "connectivities = " + m.group(2) + ","  ; # comma to support the single connectivities, too.
                namespace = {}
                exec(s, namespace)
                connectivities = list(namespace['connectivities'])
                AAIG_connectivities_dict[i_AAIG_name] = connectivities
    print(AAIG_connectivities_dict)

load_connectivities_from_file(CON_FILE)