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

The solution for “PYTHON STACK FUNCTION count the valid number of brackets Returns the total number of valid brackets in the string” can be found here. The following code will assist you in solving the problem.

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()

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