<doocs>2074.Reverse Nodes in Even Length Groups_1.py
def reverse(head, l):
    prev, cur, tail = None, head, head
    i = 0
    while cur and i < l:
        t = cur.next
        cur.next = prev
        prev = cur
        cur = t
        i += 1
    tail.next = cur
    return prev
def sample_funcname ( var_0 , var_1 ) :
    var_3 , var_4 , var_5 = None , var_0 , var_0
    var_7 = 0
    while var_4 and var_7 < var_1 :
        var_9 = var_4.next
        var_4.next = var_3
        var_3 = var_4
        var_4 = var_9
        var_7 += 1
    var_5.next = var_4
    return var_3
