1、list去重,順序亂掉

l1 = ['b','c','d','b','c','a','a']

l2 = list(set(l1))

print l2

另一種寫法:

l1 = ['b','c','d','b','c','a','a']

l2 = {}.fromkeys(l1).keys()

print l2

2、去重后還是原list順序

l1 = ['b','c','d','b','c','a','a']

l2 = list(set(l1))

l2.sort(key=l1.index)

print l2

另一種寫法:

l1 = ['b','c','d','b','c','a','a']

l2 = sorted(set(l1),key=l1.index)

print l2

3、寫循環代碼實現

l1 = ['b','c','d','b','c','a','a']

l2 = []

for i in l1:

if not i in l2:

l2.append(i)

print l2

簡明寫法:

l1 = ['b','c','d','b','c','a','a']

l2 = []

[l2.append(i) for i in l1 if not i in l2]

print l2

總結

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