Почему моя программа словаря возвращает случайные слова?

Question

Я сделал программу, которая позволяет пользователям вводить письмо, а затем отображает слова, начинающиеся с этой буквы. Я получил реальное письмо найти немного моей программы с этой страницы:

How to find a word that starts with a specific character

В частности: re.findall (г «\ бс \ ш +», текст)

Для того, чтобы пользователь сможет чтобы ввести любую букву, я сделал ввод (букву) и часть кода, которая преобразует этот вход в переменные верхнего и нижнего регистра, называемые буквенными буквами и буквенными обозначениями. Я затем изменил код из:

words = re.findall(r'\bs\w+', text) 

к:

words = re.findall(r'\b[(lowerletter)(upperletter)]\w+', text) 

Проблема заключается в том, когда я запускаю свою программу сейчас является то, что она дает случайные слова, не основанные на входе вы ввели. Например, я ввел букву K, и она дала мне слова, начинающиеся с r, u, p, t и т. Д.. В нижней строке и верхней переменной есть правильная информация, потому что когда я их печатаю, они содержат как верхнюю, так и нижнюю версию письма, которое я ввел. Я не знаю, что происходит.

Полный код минус пару сотен слов ниже:

import re 
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letter = input ("Please Enter the Letter you want to find the words beggining with.") 
upperletter = letter.upper() 
lowerletter = letter.lower() 
words = re.findall(r'\b[(lowerletter)(upperletter)]\w+', text) 
print (words) 

Answer 1

Variable сцепляются с оригинальным регулярное выражение с использованием + оператора.

words = re.findall(r'\b[' + lowerletter + upperletter +r']\w+', text) 

Answer 2

Regex может быть слишком много для простой проверки, как это; задача может быть выполнена стандартными строковыми методами.

Разбиение текста с расколом(), мы сравним первую букву каждого из ее слов, пониженный на вход, внутри известного списка понимания:

letter = raw_input ("Please Enter the Letter you want to find the words beggining with: ") 
words = [word for word in text.split() if word.lower()[0] == letter.lower()) 
print (words) 

Несколько интересных моментов: использование raw_input, для это не должно быть истолковано; если вы замените word.lower()[0] на word.lower().startswith(letter.lower()), вы можете проверить наличие более одного символа. Наконец, если мы используем генератор, это более эффективно с памятью (и весело :); последняя строка 2 будет:

words = (word for word in text.split() if word.lower()[0] == letter.lower()) 
for word in words: 
    print word