前言
validators.between(value, min=None, max=None)
validators.domain(value)
validators.email(value, whitelist=None)
validators.ip_address.ipv4(value)
validators.ip_address.ipv6(value)
validators.length(value, min=None, max=None)
validators.mac_address(value)
validators.url(value, public=False)
前言首先安装validators库：
pip install validators
验证一个数字value是否在最小值min和最大值max之间，value不仅仅可以是整数，也可以是其它数据类型，例如floats, decimals 和 dates。
源码解析：
def between(value, min=None, max=None):
"""
Validate that a number is between minimum and/or maximum value.
This will work with any comparable type, such as floats, decimals and dates
not just integers.
This validator is originally based on `WTForms NumberRange validator`_.
.. _WTForms NumberRange validator:
https://github.com/wtforms/wtforms/blob/master/wtforms/validators.py
Examples::
>>> from datetime import datetime
>>> between(5, min=2)
True
>>> between(13.2, min=13, max=14)
True
>>> between(500, max=400)
ValidationFailure(func=between, args=...)
>>> between(
... datetime(2000, 11, 11),
... min=datetime(1999, 11, 11)
... )
True
:param min:
The minimum required value of the number. If not provided, minimum
value will not be checked.
:param max:
The maximum value of the number. If not provided, maximum value
will not be checked.
.. versionadded:: 0.2
"""
示例代码：
from validators import between
from datetime import datetime
aa = between(3, min=2)
print(aa)
bb = between(3, min=2, max=5)
print(bb)
cc = between(3, max=2)
print(cc)
dd = between(datetime(2022, 9, 21), min=datetime(2022, 9, 19))
print(dd)
ee = between(datetime(2022, 9, 21), min=datetime(2022, 9, 19), max=datetime(2022, 10, 19))
print(ee)
ff = between(datetime(2022, 9, 21), max=datetime(2022, 9, 19))
print(ff)
运行结果：
验证value是否是一个有效域。如果value是一个有效域名，函数返回True, 否则返回 ValidationFailure.
源码解析：
def domain(value):
"""
Return whether or not given value is a valid domain.
If the value is valid domain name this function returns ``True``, otherwise
:class:`~validators.utils.ValidationFailure`.
Examples::
>>> domain('example.com')
True
>>> domain('example.com/')
ValidationFailure(func=domain, ...)
Supports IDN domains as well::
>>> domain('xn----gtbspbbmkef.xn--p1ai')
True
.. versionadded:: 0.9
.. versionchanged:: 0.10
Added support for internationalized domain name (IDN) validation.
:param value: domain string to validate
"""
示例代码：
from validators import domain
aa = domain('example.com')
print(aa)
bb = domain('example..com')
print(bb)
运行结果：
验证是否是合法的邮件地址，如果是，函数返回True, 否则返回 ValidationFailure.
源码解析：
def email(value, whitelist=None):
"""
Validate an email address.
This validator is based on `Django's email validator`_. Returns
``True`` on success and :class:`~validators.utils.ValidationFailure`
when validation fails.
Examples::
>>> email('someone@example.com')
True
>>> email('bogus@@')
ValidationFailure(func=email, ...)
.. _Django's email validator:
https://github.com/django/django/blob/master/django/core/validators.py
.. versionadded:: 0.1
:param value: value to validate
:param whitelist: domain names to whitelist
:copyright: (c) Django Software Foundation and individual contributors.
:license: BSD
"""
示例代码：
from validators import email
aa = email("123@qq.com")
print(aa)
bb = email("123@.com")
print(bb)
运行结果：
验证是否是合法的ipv4地址，如果是，函数返回True, 否则返回 ValidationFailure.
源码解析：
def ipv4(value):
"""
Return whether a given value is a valid IP version 4 address.
This validator is based on `WTForms IPAddress validator`_
.. _WTForms IPAddress validator:
https://github.com/wtforms/wtforms/blob/master/wtforms/validators.py
Examples::
>>> ipv4('123.0.0.7')
True
>>> ipv4('900.80.70.11')
ValidationFailure(func=ipv4, args={'value': '900.80.70.11'})
.. versionadded:: 0.2
:param value: IP address string to validate
"""
示例代码：
from validators.ip_address import ipv4
aa = ipv4("127.0.0.1")
print(aa)
bb = ipv4("333.1.1.1")
print(bb)
运行结果：
验证是否是合法的ipv6地址，如果是，函数返回True, 否则返回 ValidationFailure.
源码解析：
def ipv6(value):
"""
Return whether a given value is a valid IP version 6 address
(including IPv4-mapped IPv6 addresses).
This validator is based on `WTForms IPAddress validator`_.
.. _WTForms IPAddress validator:
https://github.com/wtforms/wtforms/blob/master/wtforms/validators.py
Examples::
>>> ipv6('abcd:ef::42:1')
True
>>> ipv6('::ffff:192.0.2.128')
True
>>> ipv6('::192.0.2.128')
True
>>> ipv6('abc.0.0.1')
ValidationFailure(func=ipv6, args={'value': 'abc.0.0.1'})
.. versionadded:: 0.2
:param value: IP address string to validate
"""
示例代码：
from validators.ip_address import ipv6
aa = ipv6("abcd:ef::42:1")
print(aa)
bb = ipv6("abc.0.0.1")
print(bb)
运行效果：
验证给定的字符串长度是否在指定范围内。
示例代码：
from validators import length
aa = length('aaa', min=2)
print(aa)
bb = length("aaa", min=2, max=5)
print(bb)
cc = length("aaa", max=2)
print(cc)
运行结果：
验证是否是合法的mac地址，如果是，函数返回True, 否则返回 ValidationFailure.
示例代码：
from validators import mac_address
aa = mac_address('01:23:45:67:ab:CD')
print(aa)
bb = mac_address('00:00:00:00:00')
print(bb)
运行结果：
验证是否是合法的url，如果是，函数返回True, 否则返回 ValidationFailure.
Parameters:
value – 要验证的url
public – (default=False) Set True to only allow a public IP address
示例代码：
from validators import url
aa = url('http://www.baidu.com')
print(aa)
bb = url("www.baidu.com")
print(bb)
cc = url("http://127.0.0.1")
print(cc)
dd = url("http://127.0.0.1", public=True)
print(dd)
运行结果：
到此这篇关于python中validators库的使用方法详解的文章就介绍到这了,更多相关python validators库内容请搜索易知道(ezd.cc)以前的文章或继续浏览下面的相关文章希望大家以后多多支持易知道(ezd.cc)！
