String translation table

	import string
	# In [1]: string.punctuation
	# Out[1]: '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'
	# In [2]: string.uppercase
	# Out[2]: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
	# In [3]: " " * len(string.punctuation) + string.lowercase
	# Out[3]: ' abcdefghijklmnopqrstuvwxyz'
	# translation table maps upper case to lower case and punctuation to spaces
	translation_table = string.maketrans(string.punctuation+string.uppercase,
	" " * len(string.punctuation) + string.lowercase)
	line = ""
	line = line.translate(translation_table)
	# In [4]: line
	# Out[4]: 'foo bar bizz'
	word_list = line.split()
	# In [5]: word_list
	# Out[5]: ['foo', 'bar', 'bizz']

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