Invalid syntax errors in my biogeme code

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syntax

These are my code and i noticed an error like this
:

 File "<ipython-input-161-70977abcbe00>", line 6
    B_ ivtt1 = Beta('B_ ivtt1', 0, None, None, 0)
       ^
SyntaxError: invalid syntax

my code:
ASC_autod = Beta('ASC_autod', 0, None, None, 0)
ASC_autop = Beta('ASC_autop', 0, None, None, 0)
ASC_walk = Beta('ASC_walk', 0, None, None, 0)
ASC_metro = Beta('ASC_metro', 0, None, None, 0)
ASC_ctrain = Beta('ASC_ctrain', 0, None, None, 1)
B_ ivtt1 = Beta('B_ ivtt1', 0, None, None, 0)
B_ ivtt2 = Beta('B_ ivtt2', 0, None, None, 0)
B_ ivtt3 = Beta('B_ ivtt3', 0, None, None, 0)
B_ ivtt4 = Beta('B_ ivtt4', 0, None, None, 0)
B_ ivtt5 = Beta('B_ ivtt5', 0, None, None, 0)
B_ avail1 = Beta('B_ avail1 ', 0, None, None, 0)
B_ avail2 = Beta('B_ avail2 ', 0, None, None, 0)
B_ avail3 = Beta('B_ avail3 ', 0, None, None, 0)
B_ avail4 = Beta('B_ avail4 ', 0, None, None, 0)
B_ avail5 = Beta('B_ avail5 ', 0, None, None, 0)
B_ t-fare = Beta('B_ t-fare ', 0, None, None, 0)
B_ g-fare = Beta('B_ g-fare ', 0, None, None, 0)
B_age = Beta('B_age', 0, None, None, 0)
B_pinc = Beta('B_pinc', 0, None, None, 0)
B_occ = Beta('B_occ', 0, None, None, 0)
B_hhsize = Beta('B_hhsize', 0, None, None, 0)
B_nveh = Beta('B_nveh', 0, None, None, 0)
B_nwkrs = Beta('B_nwkrs', 0, None, None, 0)
B_hinc = Beta('B_hinc', 0, None, None, 0)

What I have tried:

Hi
I noticed

invalid syntax

in my code . I tried to fix it in a different way but no success, could you please help me

Thanks