title: Inconsistent use of tabs and spaces in indentation
body: <pre><code>def contains_sequence(dna1, dna2):
      ''' (str, str) -&gt; bool
  
      Return True if and only if DNA sequence dna2 occurs in the DNA sequence
      dna1.
  
      &gt;&gt;&gt; contains_sequence('ATCGGC', 'GG')
      True
      &gt;&gt;&gt; contains_sequence('ATCGGC', 'GT')
      False
  
      '''
      b=False
      len2=len(dna2)
      i=0
      for j in dna1:
          temp=dna1[i:i+len2]
          if temp == dna2:
              b=True
          i=i+1
      return b
  </code></pre>
  
  <p>I am new to Python. The program pasted above gives me an error "Inconsistent use of tabs and spaces in indentation" at line "if temp == dna2:" specifically. Can someone please help me out in finding out how the indentation is incorrect?</p>