????

??????

??5.1 ??????

#!/usr/bin/python
# Filename: expression.py

length = 5
breadth = 2
area = length * breadth
print 'Area is', area
print 'Perimeter is', 2 * (length + breadth)

????????code/expression.py??

???

$ python expression.py
Area is 10
Perimeter is 14

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???ε????????洢??????????????????С????????????????????????ε?????????????????length * breadth?????洢?????area?У??????print?????????????????????У??????????????2 * (length + breadth)?????

???????Python??δ????????????????????????????'Area is'?????area?????????Python?????????????????????????????????????????????????????????????????????????????????????????????????????Python?????????????????????????????????