str.maketrans("xy","mn"),"python".translate(table)

这个方法用于创建字符映射表，其中把字符串"x"替换成"m"，把字符串"y"替换成"n"。在调用translate方法时，将字符串"python"作为参数传递给它，translate方法将使用映射表来替换原始字符串中的字符。因此，最终输出的结果是"mnthn"。这种方法对于需要替换一些特定字符的字符串非常有用。

相关问题

str.maketrans有什么用

str.maketrans是Python字符串函数，用于创建一个映射表，可以用来替换字符串中指定的字符。可以用这个映射表作为参数传递给str.translate()函数，用来将字符串中的某些字符替换成其他字符，或者删除某些字符。例如：

input_str = "Hello World!"
trans_table = str.maketrans("o", "e")
output_str = input_str.translate(trans_table)
print(output_str) # 输出：Helle Werld!

这里我们使用`srt.maketrans`函数创建了一个映射表`trans_table`，将字符串中的字符`o`替换成字符`e`。然后，我们使用`str.translate`函数将输入字符串`input_str`中的字符`o`替换成了字符`e`，得到了输出字符串`output_str`。

table = str.maketrans('', '', string.punctuation)

This line of code creates a translation table that can be used to remove all punctuation marks from a string. Specifically, it uses the string method `maketrans()` to create a translation table that maps each punctuation mark to None (i.e. it removes them from the string). The first two arguments of `maketrans()` are empty strings, which means that no characters will be replaced by other characters. The third argument, `string.punctuation`, is a predefined string in the `string` module that contains all punctuation marks.

This translation table can be passed to the `translate()` method of a string to remove all punctuation marks. For example:

text = "Hello, world!"
clean_text = text.translate(table)
print(clean_text)   # Output: "Hello world"

Here, `table` is the translation table created by `maketrans()`, and `clean_text` is the original text with all punctuation marks removed.