関連ワード:  python get first letter of a string    python get first character of a string    python get first letter of string in list    python get first 5 letters of a string    python get first n characters of a string    python get first 3 characters of a string    python get first two characters of a string    python get first 10 characters of a string    python get first 4 characters of a string    python get first 5 characters of a string