Adds function for previewing contents of df

wrangle/df/df_print_values.py

@@ -0,0 +1,17 @@
+def df_print_values(data, n=5):
+
+    '''Shows the most common values for each column
+    in a dataframe.
+    
+    data | DataFrame | a pandas dataframe with the data
+    n | int | Number of most common values to show
+    '''
+
+    for col in data.columns:
+
+        length = len(col)
+        dashes = "-" * length
+
+        print("%s \n%s" % (col, dashes))
+        print(data[col].value_counts().head(n))
+        print("\n")