python判断英文字母_python 判断中英文、数字及全角半角等

def is_chinese(uchar):

"""判断一个unicode是否是汉字"""

if uchar >= u'\u4e00' and uchar<=u'\u9fa5':

return True

else:

return False

def is_number(uchar):

"""判断一个unicode是否是数字"""

if uchar >= u'\u0030' and uchar<=u'\u0039':

return True

else:

return False

def is_alphabet(uchar):

"""判断一个unicode是否是英文字母"""

if (uchar >= u'\u0041' and uchar<=u'\u005a') or (uchar >= u'\u0061' and uchar<=u'\u007a'):

return True

else:

return False

def is_other(uchar):

"""判断是否非汉字，数字和英文字符"""

if not (is_chinese(uchar) or is_number(uchar) or is_alphabet(uchar)):

return True

else:

return False

def B2Q(uchar):

"""半角转全角"""

inside_code=ord(uchar)

if inside_code<0x0020 or inside_code>0x7e: #不是半角字符就返回原来的字符

return uchar

if inside_code==0x0020: #除了空格其他的全角半角的公式为:半角=全角-0xfee0

inside_code=0x3000

else:

inside_code+=0xfee0

return unichr(inside_code)

def Q2B(uchar):

"""全角转半角"""

inside_code=ord(uchar)

if inside_code==0x3000:

inside_code=0x0020

else:

inside_code-=0xfee0

if inside_code<0x0020 or inside_code>0x7e: #转完之后不是半角字符返回原来的字符

return uchar

return unichr(inside_code)

def stringQ2B(ustring):

"""把字符串全角转半角"""

return "".join([Q2B(uchar) for uchar in ustring])

def uniform(ustring):

"""格式化字符串，完成全角转半角，大写转小写的工作"""

return stringQ2B(ustring).lower()

def string2List(ustring):

"""将ustring按照中文，字母，数字分开"""

retList=[]

utmp=[]

for uchar in ustring:

if is_other(uchar):

if len(utmp)==0:

continue

else:

retList.append("".join(utmp))

utmp=[]

else:

utmp.append(uchar)

if len(utmp)!=0:

retList.append("".join(utmp))

return retList