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{
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"name": "stdout",
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"text": [
"True\n",
"False\n",
"True\n"
]
}
],
"source": [
"# ---------------------------------------------------------------\n",
"# python best courses https://courses.tanpham.org/\n",
"# ---------------------------------------------------------------\n",
"# Write a Python program to find validity of a string of parentheses, '(', ')', '{', '}', '[' and ']. \n",
"# These brackets must be close in the correct order, \n",
"# for example \"()\" and \"()[]{}\" are valid but \"[)\", \"({[)]\" and \"{{{\" are invalid.\n",
"\n",
"class py_solution:\n",
" def is_valid_parenthese(self, str1):\n",
" stack, pchar = [], {\"(\": \")\", \"{\": \"}\", \"[\": \"]\"}\n",
" for parenthese in str1:\n",
" if parenthese in pchar:\n",
" stack.append(parenthese)\n",
" elif len(stack) == 0 or pchar[stack.pop()] != parenthese:\n",
" return False\n",
" return len(stack) == 0\n",
"\n",
"print(py_solution().is_valid_parenthese(\"(){}[]\"))\n",
"print(py_solution().is_valid_parenthese(\"()[{)}\"))\n",
"print(py_solution().is_valid_parenthese(\"()\"))"
]
}
],
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