How to use 'balanced parentheses in python' in Python

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79def close_parens_needed(expr):
80 """Return the number of left-parentheses needed to make 'expr'
81 balanced.
82
83 >>> close_parens_needed("1+2")
84 0
85 >>> close_parens_needed("(1 + 2)")
86 0
87 >>> close_parens_needed("(1 + 2")
88 1
89 >>> close_parens_needed("(1 + (2 *")
90 2
91 >>> close_parens_needed("(1 + (2 * 3) + (4")
92 2
93 """
94 return expr.count("(") - expr.count(")")
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