<qiyuangong>028_Implement_strStr()_2.py
def strStr( haystack, needle):
    lsh, lsn = len(haystack), len(needle)
    if lsn == 0:
        return 0
    pos, index = 0, 0
    while index <= lsh - lsn:
        if haystack[index] == needle[0]:
            
            if haystack[index:index + lsn] == needle:
                return index
        index += 1
    return -1
def sample_funcname ( var_0 , var_1 ) :
    var_3 , var_4 = len ( var_0 ) , len ( var_1 )
    if var_4 == 0 :
        return 0
    var_6 , var_7 = 0 , 0
    while var_7 <= var_3 - var_4 :
        if var_0 [ var_7 ] == var_1 [ 0 ] :
            if var_0 [ var_7 : var_7 + var_4 ] == var_1 :
                return var_7
        var_7 += 1
    return - 1
