前言
首先安装validators库：
pip install validators
validators.between(value, min=None, max=None)
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：
validators.domain(value)
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：
validators.email(value, whitelist=None)
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('[email protected]')
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("[email protected]")
print(aa)
bb = email("[email protected]")
print(bb)
运行结果：
validators.ip_address.ipv4(value)
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：
validators.ip_address.ipv6(value)
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：
validators.length(value, min=None, max=None)
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：
validators.mac_address(value)
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：
validators.url(value, public=False)
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：
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