Easy way to convert a list into a string

Converting the python list to string

Python 3.6.6 (v3.6.6:4cf1f54eb7, Jun 27 2018, 03:37:03) [MSC v.1900 64 bit (AMD64)] on win32
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a=['1','2','3','4']
s="".join(a)
s
'1234'
type(s)