python列表推导式操作解析

a = [5,10,15,20]
b = []
for n in a:
  if n > 5:
    b.append(n*10)
print(b)

a = [5,10,15,20]

b = [n*10 for n in a if n > 5] #推导式:生成新的列表，将a中大于5的数*10储存

print(b) #[100,150,200]

ls = [-5,2,12,20]#创建列表

#输出ls中大于0的数
print([x for x in ls if x > 0])
#[2,12,20]

#应用函数，求绝对值
print([abs[x] for x in ls])
#[5,2,12,20]

#调用函数，转换大写
pet = ['Dog','Cat','Fox']
print([newPet.upper() for newPet in pet])
#['DOG','CAT','FOX']