有三种方法可以用来判断某个变量是否被定义过,见下面几个例子,注意变量名称要用引号括起来
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if 'ss' in locals().keys():
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print 'yes'
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else:
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print 'no'
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try:
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print ss
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except NameError:
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print 'this var not defined'
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if 'var_name' in dir():
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print 'yes'
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else:
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print 'no'
下面是一组python用于验证数据是否合法的函数,包括检测类型是否为整数、浮点数、字符串、字典、元组、数组、bool类型等,还可以检测是否为货币、是否为空、是否是合法的日期格式,是否是邮件地址(Email),是否是中文字符,是否符合用户账号的规则,是否是合法的ip地址等等。
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#! /usr/bin/env python
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#coding=utf-8
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import types
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import re
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"""
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验证所有表单提交的数据
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"""
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#判断是否为整数 15
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def IsNumber(varObj):
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return type(varObj) is types.IntType
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#判断是否为字符串 string
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def IsString(varObj):
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return type(varObj) is types.StringType
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#判断是否为浮点数 1.324
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def IsFloat(varObj):
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return type(varObj) is types.FloatType
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#判断是否为字典 {'a1':'1','a2':'2'}
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def IsDict(varObj):
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return type(varObj) is types.DictType
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#判断是否为tuple [1,2,3]
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def IsTuple(varObj):
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return type(varObj) is types.TupleType
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#判断是否为List [1,3,4]
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def IsList(varObj):
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return type(varObj) is types.ListType
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#判断是否为布尔值 True
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def IsBoolean(varObj):
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return type(varObj) is types.BooleanType
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#判断是否为货币型 1.32
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def IsCurrency(varObj):
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#数字是否为整数或浮点数
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if IsFloat(varObj) and IsNumber(varObj):
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#数字不能为负数
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if varObj >0:
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return isNumber(currencyObj)
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return False
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return True
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#判断某个变量是否为空 x
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def IsEmpty(varObj):
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if len(varObj) == 0:
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return True
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return False
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#判断变量是否为None None
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def IsNone(varObj):
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return type(varObj) is types.NoneType# == "None" or varObj == "none":
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#判断是否为日期格式,并且是否符合日历规则 2010-01-31
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def IsDate(varObj):
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if len(varObj) == 10:
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rule = '(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)$/'
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match = re.match( rule , varObj )
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if match:
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return True
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return False
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return False
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#判断是否为邮件地址
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def IsEmail(varObj):
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rule = '[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$'
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match = re.match( rule , varObj )
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if match:
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return True
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return False
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#判断是否为中文字符串
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def IsChineseCharString(varObj):
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for x in varObj:
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if (x >= u"\u4e00" and x<=u"\u9fa5") or (x >= u'\u0041' and x<=u'\u005a') or (x >= u'\u0061' and x<=u'\u007a'):
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continue
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else:
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return False
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return True
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#判断是否为中文字符
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def IsChineseChar(varObj):
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if varObj[0] > chr(127):
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return True
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return False
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#判断帐号是否合法 字母开头,允许4-16字节,允许字母数字下划线
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def IsLegalAccounts(varObj):
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rule = '[a-zA-Z][a-zA-Z0-9_]{3,15}$'
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match = re.match( rule , varObj )
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if match:
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return True
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return False
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#匹配IP地址
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def IsIpAddr(varObj):
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rule = '\d+\.\d+\.\d+\.\d+'
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match = re.match( rule , varObj )
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if match:
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return True
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return False
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if __name__=='__main__':
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print 'IsDate:',IsDate('2010-01-31')
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print 'IsNone:',IsNone(None)
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print 'IsEmpty:',IsEmpty('1')
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print 'IsCurrency:',IsCurrency(1.32)
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print 'IsList:',IsList([1,3,4])
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print 'IsTuple:',IsTuple([1,3,4])
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print 'IsDict:',IsDict({'a1':'1','a2':'2'})
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print 'IsFloat:',IsFloat(1.2)
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print 'IsString:',IsString('string')
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print 'IsNumber:',IsNumber(15)
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print 'IsEmail:',IsEmail('sgicer@163.com')
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print 'IsChineseChar:',IsChineseChar(u'啊')
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print 'IsChineseCharString:',IsChineseCharString(u'啊倒萨')
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print 'IsLegalAccounts:',IsLegalAccounts('alan_z')
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print 'IsIpAddr:',IsIpAddr('127.1110.0.1')
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pass
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