python_推导式

列表推导式

　　目的：方便的生成一个列表

　　格式：

　　　　v1 = [i for i in 可迭代对象 ]

　　　　v2 = [i for i in 可迭代对象 if条件]#条件为True菜进行append

v1 = [i for i in ‘alex‘] # 变量 = [for循环的变量 for循环一个可迭代的对象] v2 = [i+100 for i in range(10)] v3 = [100 for i in range(10)] v4 = [99 if i > 5 else 66 for i in range(10)] def func():     print(123) v5 = [func for i in range(10)] v6 = [lambda :i for i in range(10)] v7 = [lambda x:x*i for i in range(10)] print(v1) print(v2) print(v3) print(v4) print(v5) print(v6[9]()) print(v7[0](2))  

# 筛选功能 v8 = [i for i in range(10) if i >5] print(v8)

集合推导式

　　格式：v1 = {i for i in 可迭代对象} 

v8 = {i for i in range(10) if i >5}
print(v8)

字典推导式

　　格式：v1 = {‘k‘+str(i):i for i in range(10)} 

v1 = {‘k‘+str(i):i for i in range(10)}
print(v1)

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