YouTipPython Exercise Example74
# Python2.x Python Exercise Instance 74
[ Python 100 Examples](#)
**Title:** List sorting and concatenation.
**Program Analysis:** Sorting can use the sort() method, and concatenation can use the + operator or the extend() method.
Program source code:
## Instance
```python
#!/usr/bin/python
# -*- coding: UTF-8 -*-
if __name__ == ' __main__ ':
a = [1,3,2]
b = [3,4,5]
a.sort()
# Sort list a
print a
# Concatenate lists a and b
print a+b
# Concatenate lists a and b
a.extend(b)
print a
[1, 2, 3]
[1, 2, 3, 3, 4, 5]
[1, 2, 3, 3, 4, 5]
[![Image 4: Python 100 Examples](http://www.runo