Python中手动写判断电话号码

#判断是不是电话号码
方法1

def checkPhone(str):
    if len(str) !=11:
        return False
    elif str[0]!="1":
        return False
    #elif str

    for i in str:
        if i>="0" or i<="9":
            return True

    return False
print(checkPhone("13135354568"))
print(checkPhone("23135354568"))

方法2
import re

print("--------------------------")
def checkPhone2(str):
    pat=r"^1(([35789]\d)|(47))\d{8}$"
    res= re.match(pat,str)
    print(res)

print(checkPhone2("13135354568"))
print(checkPhone2("23135354568"))
print(checkPhone2("13135b54568"))
print(checkPhone2("14735354568"))

方法3

def checkPhone3(str):
    pat=r"(1(([35789]\d)|(47))\d{8})"
    res= re.findall(pat,str)
    print(res)
checkPhone3("dfad14735354568fewdf13135354568klmdfa")