Two-dimensional list which contains strings and integers

Question

I have a two-dimensional list; ie a nested list, which contains integers and strings.

mylist = [[92, "james"], [88, "john"], [75, "robert"], [80, "michael"], [25, "william"], [54, "david"], [59, "richard"], [74, "charles"], [46, "joseph"], [90, "thomas"], [80, "christopher"]]

I want to a way to go through the strings only, check if they start with a particular letter; say j , delete it and ignore the rest of the elements that don't meet this condition.

The desired result will look like this:

mylist = [[92, "ames"], [88, "ohn"], [75, "robert"], [80, "michael"], [25, "william"], [54, "david"], [59, "richard"], [74, "charles"], [46, "oseph"], [90, "thomas"], [80, "christo, her"]]

Answer 1

If I understand you correctly, here is a solution using list comprehension :

mylist = [[num, (name[1:] if name[0] == "j" else name)]
          for num, name in mylist]

Answer 2

您可以使用函数lstrip()删除前导字符：

[[i, j.lstrip('j')] for i, j in mylist]