列表推导式

# 列表推导式
eggs = []
for i in range(10):
    eggs.append('鸡蛋'+str(i))
print(eggs)

简化

eggs = ['鸡蛋%d'%i for i in range(10)]
print(eggs)

 

【i for i in range(10)】

 

ret = [i for i in range(30) if i%3==0]
print(ret)

a.count(X) # a中的X出现的次数