title: How can i check if the input is in English language
body: <p>How can I check if the input is letters not numbers and only the English language?</p>
  
  <pre><code>f="Hello"
  print f.isalpha()
  True
  
  
  f="Hello5"
  print f.isalpha()
  False
  
  
  f="اهلا"
  print f.isalpha()
  True
  </code></pre>
  
  <p>I want it to be True only when f is letters in English and without numbers, like this:</p>
  
  <pre><code>f="اهلا"
  print f.isalpha()
  False
  
  
  f="Hello"
  print f.isalpha()
  True
  </code></pre>