praveenvvstgy

stack1 = []
stack2 = []

def enqueuue(a):
    stack1.append(a)

def dequeue():
    if len(stack2) > 0:
       return stack2.pop()
    elif len(stack2) == 0 and len(stack1) > 0:

praveenvvstgy

def braces_validator(string):
    openers = "({["
    closers = ")}]"    
    stack = []    
    for char in string:
        if char in openers:
            stack.append(openers.index(char))
        elif char in closers:
            if len(stack) == 0 or stack.pop() != closers.index(char):
                return False

praveenvvstgy

openers = "({["
closers = ")}]"

def paranthesis_match(string, pos):
    stack = [string[pos]]
    for i in range(pos + 1, len(string)):
        if string[i] in openers:
            stack.append(string[i])
        if string[i] in closers:
            stack.pop()

praveenvvstgy

for file in `find . -type f -name "*.jpg"`
do
	thumbnail_file="./thumbnail/${file##*/}"
    if [ ! -e "${file%/*}/thumbnail" ]; then mkdir -p "${file%/*}/${thumbnail_dir}"; fi
    echo "Create thumbnail for image $file"
    `convert -thumbnail x300 $file $thumbnail_file`
done