Expand tuple section.

day_1.md

@@ -340,7 +340,21 @@ lista = [false, 1, "due", 3.0, 4, 5]
 - Si definiscono con le parentesi tonde
 
 ```python
-tupla = ('a', 1, 2, 'bcd')
+tupla = ('a', 1, 2, '3.0')
+```
+
+```
+>>> tupla[1] = 1.0
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+TypeError: 'tuple' object does not support item assignment
+```
+
+```
+>>> tupla.append('sei')
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+AttributeError: 'tuple' object has no attribute 'append'
 ```
 
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