<>之Choose

#!/usr/bin/python
#encoding:utf8

#ph值判别程序
print "Please input a ph value: "
def phchoose(ph):
	'''ph value and choose acidic or basic'''
	if ph < 7.0:
	    print "ph value %s is acidic." % ph
	elif ph > 7.0:
		print "ph value %s is basic." % ph
	else:
		print "ph value %s is neutral." % ph

ph = float(raw_input())
phchoose(ph)

#年龄体重指数和患心脏病的关系
#---------------年龄---
#------------< 45    >=45
#体重< 22.0  低      中
#指数>=22.0  中      高

#method_1
def method1(age,bmi):
	if age < 45:
		if bmi < 22.0:
			return 'risk = low'
		else:
		    return 'risk = medium'
	else:
		if bmi < 22.0:
			return 'risk = medium'
		else:
			return 'risk = high'

print "Please input age and bmi: "
age = int(raw_input())
bmi = float(raw_input())
print "Age %d Bmi %s" % (age,bmi),
risk = method1(age,bmi)
print risk

#method_2
def method2(age,bmi):
	young = age < 45
	slim  = bmi < 22.0
	if young:
		if slim:
			return 'risk = low'
		else:
			return 'risk = medium'
	else:
		if slim:
			return 'risk = medium'
		else:
			return 'risk = high'
risk2 = method2(age,bmi)
print 'method2 : ', risk2

#method_3
def method3(age,bmi):
	young = age < 45
	slim  = bmi < 22.0
	if young and slim:
		return 'risk = low'
	elif young and not slim:
		return 'risk = medium'
	elif not young and slim:
		return 'risk = medium'
	elif not young and not slim:
		return 'risk = high'
risk3 = method3(age,bmi)
print 'method3 : ',risk3

#mehtod_4
young = age < 45
heavy = bmi >= 22.0
table = [['medium','high'],['low','medium']]
risk = table[young][heavy]
print 'method4 :  risk =',risk