Fix print syntax

basics.md

@@ -283,13 +283,13 @@ Type and run the following program:
 ```python
 # Filename : var.py
 i = 5
-print i
+print(i)
 i = i + 1
-print i
+print(i)
 
 s = '''This is a multi-line string.
 This is the second line.'''
-print s
+print(s)
 ```
 
 Output: