"PYTHON STACK FUNCTION count the valid number of brackets Returns the total number of valid brackets in the string" Code Answer's
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PYTHON STACK FUNCTION count the valid number of brackets Returns the total number of valid brackets in the string
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()
Source: stackoverflow.com
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