関連ワード:  python check if string is number only    python check if string is numeric only    python check if string is just numbers    python check if string contains numbers only    python check if string is only whitespace    python check if string is only letters    python check if string is only digits    python check if string is only spaces    python check if string is only punctuation    python check if string is only alphanumeric  
結果 : python check if string is number only