python step1综合示例

#! /usr/bin/env python
#coding=utf-8
bob = dict(name='Bob Smith', age=42, pay=30000, job='dev')
sue = dict(name='Sue Jones', age=45, pay=40000, job='hdw')
print(bob)


db = {}                                                         
db['bob'] = bob # reference in a dict of dicts                  
db['sue'] = sue                                                 
                                                                
print(db['bob']['name']) # fetch bob's name                            
db['sue']['pay'] = 50000 # change sue's pay                     
print(db['sue']['pay'])                                                

print(db)

for key in db:
 print(key, '=>', db[key]['name'])


for key in db:
 print(key, '=>', db[key]['pay'])

for key in db:
 print(db[key]['name'].split()[-1])
 db[key]['pay'] *= 1.10


for record in db.values():
 print(record['pay'])


x = [db[key]['name'] for key in db]
print(x)


x = [rec['name'] for rec in db.values()]
print(x)

db['tom'] = dict(name='Tom', age=50, job=None, pay=0)
print(db['tom'])

print(list(db.keys()))

print([rec['age'] for rec in db.values()])

print([rec['name'] for rec in db.values() if rec['age'] >= 45])