u1_python应用

{}.format()用法

• 元组传值——无*

print(‘my name is {}, age is {}’.format(‘lala’,22))

• 列表传值——1个 *

li = [‘chenpeng’,22]
print(‘my name is {}, age is {}’.format(*li))

• 字典传值——2个 **

hash = {‘name’:‘chenpeng’, ‘age’:20}
print(‘my name is {name}, age is {age}’.format(**hash))

• **【 *args, kwargs】

*args 是用来发送一个非键值对的可变数量的参数列表给一个函数,注意传的是列表
def test_var_args(f_arg, *args):
print("{}".format(f_arg))
print(*args)
for arg in args:
print("*args 里面的内容",arg)
test_var_args(‘yasoob’, ‘python’, ‘eggs’, ‘test’)

yasoob
python eggs test
*args 里面的内容 python
*args 里面的内容 eggs
*args 里面的内容 test

**kwargs 允许你将不定长度的键值对, 作为参数传递给一个函数。
def greet_me(a, *args, **kwargs):
print(a)
print(*args)
for key, value in kwargs.items():
print("{0}=={1}".format(key,value))
greet_me(‘yasoob’, ‘python’, ‘eggs’, ‘test’, name=“yasoob”)

yasoob
python eggs test
nameyasoob
name1yes
def test_args_kwargs(arg1, arg2, arg3):
print(“arg1:”, arg1)
print(“arg2:”, arg2)
print(“arg3:”, arg3)
args = (“two”, 3, 5)
kwargs = {“arg3”: 3, “arg2”: “two”, “arg1”: 5}

test_args_kwargs(*args)
print("+++++")
test_args_kwargs(**kwargs)

 test_args_kwargs(*args)

arg1: two
arg2: 3
arg3: 5

 print("+++++")

+++++

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test_args_kwargs(**kwargs)

arg1: 5
arg2: two
arg3: 3

匿名函数 lambda
https://www.jianshu.com/p/84f3e0f4d218