Python split array and check the 0 index if the same and join it

I have an array looks like:

['varyasyon__in=27', 'varyasyon__in=25', 'varyasyon__in=1']

and I want to split every value on = and join it to be a string like:

varyasyon__in=27,25,1

>Solution :

a = ['varyasyon__in=27', 'varyasyon__in=25', 'varyasyon__in=1']
data = {}
for i in a:
    key, val = i.split('=')
    try:
        data[key].append(val)
    except KeyError:
        data[key] = [val]
for i, j in data.items():
    print(f"{i}={','.join(j)}")

varyasyon__in=27,25,1