python3.6, ide is pycharm
lambda cannot raise Exception?
files = os.listdir("data/")
map(lambda x: x[0:6] if len(x) > 6 else raise Exception("") , files) 
/ / Please paste the code text below (do not replace the code with pictures)
not just Python3.6
in the lambda of Python, statements and annotations are not allowed, only expressions
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