PYTHON STACK FUNCTION count the valid number of brackets Returns the total number of valid brackets in the string

Sleepy Sardine answered on December 13, 2020 Popularity 7/10 Helpfulness 1/10

answer PYTHON STACK FUNCTION count the valid number of brackets Returns the total number of valid brackets in the string

PYTHON STACK FUNCTION count the valid number of brackets Returns the total number of valid brackets in the string

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import sys

def error(c, line_number, column_number):
    print 'Error: unmatched', c, 'line', line_number, 'column', column_number

def check(stack, wanted, c, line_number, column_number):
    if stack[-1] != wanted:
        error(c, line_number, column_number)
    else:
        stack.pop()

def check_parentheses(f):
    stack = list()
    line_number = 0
    for line in f:
        line_number = line_number + 1
        column_number = 0
        for c in line:
            column_number = column_number + 1
            if c == '(' or c == '[' or c == '{':
                stack.append(c)
            elif c == ')':
                check(stack, '(', ')', line_number, column_number)
            elif c == ']':
                check(stack, '[', ']', line_number, column_number)
            elif c == '}':
                check(stack, '{', '}', line_number, column_number)

def main():
    filename = sys.argv[1]
    try:
        f = file(filename)
    except IOError:
        sys.stderr.write('Error: Cannot open file %s' % filename)
        sys.exit(1)
    check_parentheses(f)
    f.close()

main()

Popularity 7/10 Helpfulness 1/10 Language typescript

Source: stackoverflow.com

Tags: brackets count function python stack string typescript

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Contributed on Dec 13 2020

Sleepy Sardine

0 Answers Avg Quality 2/10

PYTHON STACK FUNCTION count the valid number of brackets Returns the total number of valid brackets in the string

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