title: How do I put a file path variable into pandas.read_csv?
body: <p>I tried to apply it through os.environ like so:</p>
  
  <pre><code>import os
  import pandas as pd
  
  os.environ["FILE"] = "File001"
  
  df = pd.read_csv('/path/$FILErawdata.csv/')
  </code></pre>
  
  <p>But pandas doesn't recognize <code>$FILE</code> and instead gives me <strong>$FILErawdata.csv not found</strong></p>
  
  <p>Is there an alternative way to do this?</p>