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Python NLTK | nltk.tokenize.SExprTokenizer()

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  • Last Updated : 12 Jun, 2019
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With the help of nltk.tokenize.SExprTokenizer() method, we are able to extract the tokens from string of characters or numbers by using tokenize.SExprTokenizer() method. It actually looking for proper brackets to make tokens.

Syntax : tokenize.SExprTokenizer()
Return : Return the tokens from a string of characters or numbers.

Example #1 :
In this example we can see that by using tokenize.SExprTokenizer() method, we are able to extract the tokens from stream of characters or numbers by taking brackets in consideration.




# import SExprTokenizer() method from nltk
from nltk.tokenize import SExprTokenizer
     
# Create a reference variable for Class SExprTokenizer
tk = SExprTokenizer()
     
# Create a string input
gfg = "( a * ( b + c ))ab( a-c )"
     
# Use tokenize method
geek = tk.tokenize(gfg)
     
print(geek)

Output :

[‘( a * ( b+c ))’, ‘ab’, ‘( a-c )’]

Example #2 :




# import SExprTokenizer() method from nltk
from nltk.tokenize import SExprTokenizer
     
# Create a reference variable for Class SExprTokenizer
tk = SExprTokenizer()
     
# Create a string input
gfg = "(a b) c d (e f)"
     
# Use tokenize method
geek = tk.tokenize(gfg)
     
print(geek)

Output :

[‘(a b)’, ‘c’, ‘d’, ‘(e f)’]

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