在 Python 中索引字符串时出现问题

Question

I am trying to check the first character in each line from a separate data file. This is the loop that I am using, but for some reason I get an error that says string index out of range.

for line_no in length:
  line_being_checked = linecache.getline(file_path, line_no)

  print(line_being_checked[0]) 

Answer 1

From what I understand (not very in english), lenght is the number of lines you want to check in the files. You could do something like that:

for line in open("file.txt", "r").read().splitlines():
        print(line[0])

This way, you'll be sure that the lenght is correct.

For the error, it is possible that you have an empty line, so you could len(line) to check if it is the case.