Check list monotonicity

by

Are repeated values (e.g. [1, 1, 2]) monotonic?

If yes:

def non_decreasing(L):
    return all(x<=y for x, y in zip(L, L[1:]))

def non_increasing(L):
    return all(x>=y for x, y in zip(L, L[1:]))

def monotonic(L):
    return non_decreasing(L) or non_increasing(L)

If no:

def strictly_increasing(L):
    return all(x<y for x, y in zip(L, L[1:]))

def strictly_decreasing(L):
    return all(x>y for x, y in zip(L, L[1:]))

def strictly_monotonic(L):
    return strictly_increasing(L) or strictly_decreasing(L)

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