列表推导式
一、列表推导式
[expression for item1 in iterable1 if condition1
for item2 in iterable2 if condition2
...
for itemN in iterableN if conditionN
]
类似于
res=[]
for item1 in iterable1:
if condition1:
for item2 in iterable2:
if condition2
...
for itemN in iterableN:
if conditionN:
res.append(expression)
1.1 一般写法
lt = []
for i in range(10):
lt.append(i)
1.2 列表推导式
lt1 = [10 if i > 2 else i for i in range(10)]
print(lt1)