title: can only concatenate str (not "numpy.int64") to str
body: <p>So I am still new to python and cant figure out how to fix this command</p>
  <pre><code>unique_flag2=[string3 + x for x in unique_flag]
  </code></pre>
  <p>when I run it I keep getting this error</p>
  <pre><code>TypeError: can only concatenate str (not &quot;numpy.int64&quot;) to str
  </code></pre>
  <p>can anyone help ?</p>