Python之Dict和Set类型(入门5)

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Python之Dict和Set类型

1. Python之什么是dict

d = {
    'Adam': 95,
    'Lisa': 85,
    'Bart': 59,
    'Paul': 75
}

2. Python之访问dict

d = {
    'Adam': 95,
    'Lisa': 85,
    'Bart': 59
}
print 'Adam:', d['Adam']
print 'Lisa:', d['Lisa']
print 'Bart:', d['Bart']

3. Python中dict的特点

d = {
    95: 'Adam',
    85: 'Lisa',
    59: 'Bart'
}

4. Python更新dict

d = {
    95: 'Adam',
    85: 'Lisa',
    59: 'Bart'
}
d[72] = 'Paul'

5. Python之 遍历dict

d= {
    'Adam': 95,
    'Lisa': 85,
    'Bart': 59
}
for key in d:
    print key + ':', d[key]

6. Python中什么是set

s = set(['Adam', 'Lisa', 'Bart', 'Paul'])

7. Python之 访问set

s = set(['Adam', 'adam', 'Lisa', 'lisa', 'Bart', 'bart', 'Paul', 'paul'])
print 'adam' in s
print 'bart' in s

8. Python之 set的特点

months = set(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'])
x1 = 'Feb'
x2 = 'Sun'
if x1 in months:
    print 'x1: ok'
else:
    print 'x1: error'
if x2 in months:
    print 'x2: ok'
else:
    print 'x2: error'

9. Python之 遍历set

s = set([('Adam', 95), ('Lisa', 85), ('Bart', 59)])
for x in s:
    print x[0] + ':', x[1]

10. Python之 更新set

s = set(['Adam', 'Lisa', 'Paul'])
L = ['Adam', 'Lisa', 'Bart', 'Paul']
for name in L:
    if name in s:
        s.remove(name)
    else:
        s.add(name)
print s