Update 06_Files.md

qDoer · web-flow · commit 1d2fbbbfd8a4 · 2020-06-07T12:37:10.000+05:45
diff --git a/Notes/01_Introduction/06_Files.md b/Notes/01_Introduction/06_Files.md
@@ -220,14 +220,17 @@ Try it:
 
 ```python
 >>> import gzip
->>> with gzip.open('Data/portfolio.csv.gz') as f:
+>>> with gzip.open('Data/portfolio.csv.gz', 'rt') as f:
     for line in f:
         print(line, end='')
 
 ... look at the output ...
 >>>
 ```
 
+Note: Including the file mode of `'rt'` is critical here.  If you forget that,
+you'll get byte strings instead of normal text strings.
+
 ### Commentary:  Shouldn't we being using Pandas for this?
 
 Data scientists are quick to point out that libraries like
