Python Dict and Set types

This article mainly describes the Python Dict and Set types. Python Dict and Set types

1. what is dict in Python?

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

2. access dict with Python

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

3. dict features in Python

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

4. Python updates dict

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

5. Python traversal dict

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

6. what is set in Python?

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

7. Python access set

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

8. set features of Python

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 traversal set

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

10. update set in Python

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

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