用字典替换字母

Question

我有一段文字，我用图形符号把不同的声音分开。这些图形符号现在是列表的一部分，如下所示：

graphemes = ["th", "e", "g", "i", "r", "l", "th", "a", "t", "r", "ea", "d", "s", ...]

除此之外，我还有一本字典，它把一些图形符号和一个数字联系在一起：

graph_nums = {"th":1, "s":2, "t":3, ...}

最后，我有一套条件。例如，“如果-s在元音之后”或“如果-t在辅音前面”。

我想要做的是对图形素列表进行迭代，如果满足其中一个条件，然后用相应的数字替换该字素。

到目前为止，我一直试图这样做：

special_graphemes = ["s", "t"...] #a list with the characters that are mentioned in the conditions
vowels = ["a", "e", "i", "o", "u", ...] #a list with all the vowels and dipthongs 
consonants = ["b", "c", "d", ...] #a list of all consonants and groups of consonants
output = ""

for grapheme in graphemes: #iterate over each grapheme
    if grapheme in special_graphemes: #if the grapheme is one of the graphemes that needs to be replaced by a number
        if graphemes[grapheme-1] in vowels: #for a condition like "if -s comes after a vowel", it needs to be checked whether the previous grapheme is a vowel
            output += graph_nums.get(num) #if the previous condition applies, then replace the grapheme by its number, according to the dictionary
       elif XXXX #other conditions checked in a similar way
    else:
        output += grapheme #otherwise, just keep the grapheme as it is
print(output)

但是，当我运行它时，我会得到一个有关索引的错误(即，这是错误的：graphemes[grapheme-1])。我怎样才能获得我感兴趣的职位，并在必要时更换它们？

另外，我也不确定我访问字典和替换图形符号的方式是否正确。

Answer 1

使用Python的理解

试试这个：

graphemes = ["th", "e", "g", "i", "r", "l", "th", "a", "t", "r", "ea", "d", "s"]
graph_nums = {"th":1, "s":2, "t":3}
out_graphemes = [ x for x in (map(graph_nums.get, graphemes, graphemes)) ]
print (out_graphemes)

输出

1，e，g，I，r，l，1，a，3，r，ea，d，2