Remove duplicate items from a list in one line (with and without order preservation)

Python - Remove duplicates from list.py

# Data set.
data = ['a', 'b', 'b', 'c', 'd', 'e', 'a', 'f', 'e']

# Solution 1 - Keep first occurence only (preserves the list order)
print([ v for p, v in enumerate(data) if v not in data[0:data.index(v, p)] ])

# Solution 2 - Keep last occurence only (preserves the list order)
print([ v for p, v in enumerate(data) if v not in data[data.index(v, p)+1:] ])

# Solution 3 - Using 'set' (do **not** preserve the list order !)
print(list(set(data)))