'''string切片'''

def string_split(stringone,split):

    m = []

    if  type(split)!=str:

        return  False

    if split not in stringone :

        m.append(stringone)

        return m

    if type(stringone)!=str:

        return False

    if not  split:

        m.append(stringone)

        return m

    else:

        h=0

        l=0

        for i in range(len(stringone)):

            if stringone[i]==split:

                if i==0 and h==0:

                    n = (stringone[0])

                elif h>0:

                    n=stringone[l:i]

                else:

                    n=stringone[0:i]

                if i==len(stringone)-1:

                    c = stringone[len(stringone)-1]

                elif h>0 :

                    c=stringone[-1]

                else:

                    c=''

                if len(n)!=0 :

                    m.append(n)

                if len(c)!=0:

                        m.append(c)

                i += 1

                h += 1

                l= i

            else:

                i+=1

        return m

print(string_split('12,22,11',split='1,'))