Python String学习

最新推荐文章于 2022-12-18 20:12:11 发布

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本文通过一个简单的数据库示例展示了Python中字典的基本操作方法，包括读取、更新、删除等，并介绍了如何使用字典来存储和检索联系人信息。

website = 'http://www.python.org'
website[-3:]='com'

File "D:/untitled/day04/0401.py", line 2, in <module>
website[-3:]='com'
TypeError: 'str' object does not support item assignment

# name = 'Gumby'
# names = ['gumby','smith', 'jones']
# if name.lower() in names:
#     print('Found it')
# else:
#     print('no found')
#     replace
# print('this is a test'.replace('is', 'eez'))
# phonebook ={'Alice':'2341','Beth':'9102','Cecil':'3258'}
# print(phonebook)
# items= [('name','Gumby'),('age',42)]
# d = dict(items)
# print(d)
# print(d['name'])
#基本字典操作
# 字典的基本行为在很多方面与序列(sequence)类似:
# len(d)返回d中数量；
# d[k]返回关联到键k上的值；
# d[k]=v将值v关联到键k上；
# del d[k]删除键为k的项
# k in d 检查 d 中是否有含有键为k的项
#一个简单的数据库
people = {
    'Alice': {
        'phone': '2341',
        'addr': 'Foo drive 23'
    },
    'Beth':{
        'phone': '9102',
        'addr': 'Bar street 42'
    },
    'Cecil': {
        'phone': '3158',
        'addr': 'Baz avenue 90'
    }
}
labels = {
    'phone': 'phone number',
    'addr': 'address'
}
name = input('Name: ')
request =input('Phone number(p) or address (a)?')
if request== 'p': key = 'phone'
if request == 'a': key = 'addr'
if name in people:
    print("%s's %s is %s." % \
          (name, labels[key], people[name][key]))

phonebook={'Beth':'9102', 'Alice':'2341','Cecil':'3258'}
print("Cecil's phone is %(Cecil)s." % phonebook)

Cecil's phone is 3258.

template = '''<html>
<head><title>%(title)s</title></head>
<body>
<h1>%(title)s</h1>
<p>%(text)s</p>
</body>'''
date = {'title':'My Home page','text':'Welcome to my home page'}
print(template % date)

<html>
<head><title>My Home page</title></head>
<body>
<h1>My Home page</h1>
<p>Welcome to my home page</p>
</body>