An implementation of the OddEven sorting algorithm

OddEven.py

def oddeven(lst):
    sorted_ = False
    while not sorted_:
        sorted_ = True
        for i in range(1,len(lst)-1,2):
            if a[i] > a[i+1]:
                a[i], a[i+1] = a[i+1], a[i]
                sorted_ = False
        for i in range(0,len(lst)-1,2):
            if a[i] > a[i+1]:
                a[i], a[i+1] = a[i+1], a[i]
                sorted_ = False