python零碎知识点积累

#1.map是3.X中的生成器

#2.建立字典的方法
    bob = dict(name='Bob Smith', age=42, pay=3000, job='dev')
    
    names = ['name', 'age', 'pay', 'job']
    values = ['Sue Jones', 45, 40000, 'hdw']
    dict(zip(names,values)
    
    fields = ('name', 'age', 'job', 'pay')
    record = dict.fromkeys(fields,'')