class Solution(object):
    def wordPattern(self, pattern, str):
        """
        :type pattern: str
        :type str: str
        :rtype: bool
        """
        length = len(pattern)
        strings = str.split()
        if len(strings) != length:
            return False
	"pattern strings 检查长度是否匹配"
        
        table = dict()
        for letter, word in zip(pattern, strings):
            if letter in table:
                if word == table[letter]:
                    continue
                else:
                    return False
            table[letter] = word
        del table
	"每一个单词都会对应唯一的字母"
        
        table = dict()
        for letter, word in zip(pattern, strings):
            if word in table:
                if letter == table[word]:
                    continue
                else:
                    return False
            table[word] = letter
	"每一个字母都会对应唯一的单词"

        return True