Python allows functions to have default argument values. Default arguments are used when no explicit values are passed to these parameters during a function call. Let's look at an example. defgreet(name, message="Hello"):print(message, name)# calling function with both argumentsgreet("Alice",...
print('ip address',ip,mask) ... return None # 如果你不写return内容,Python会默默地帮你补上这一行。(缺省情况) ... >>> 2.4 return 操作符(返回一值) 我们重新梳理一下return的作用,其用户终止函数,并返回一些数据(如果有);默认情况下,返回None(如果无)。 借助return这个操作符,结果就灵活很多了。
Print a tuple: x = ("apple","banana","cherry") print(x) Try it Yourself » Example Print two messages, and specify the separator: print("Hello","how are you?", sep="---") Try it Yourself » ❮ Built-in Functions Track your progress - it's free!
def my_function(): print("Hello from a function") my_function() Try it Yourself » ArgumentsInformation can be passed into functions as arguments.Arguments are specified after the function name, inside the parentheses. You can add as many arguments as you want, just separate them with a...
print(result) # 输出: 120 Explode/Gather Keyword Argument with ** : 用 ** 来展开和收集关键字参数 在Python 中,**运算符可以用来处理关键字参数(Keyword Arguments)。它允许你将字典中的键值对解包为关键字参数(Explode),或者在函数定义中收集关键字参数(Gather)。这种方式对于处理具有可变数量的关键字参数的...
3.11 有返回值函数和无返回值函数（fruitfulfunctionsand void functions）有返回值函数（fruitfulfunctions）即为可直接返回值的函数，如数学函数；无返回值函数（voidfunctions）即为只执行一个动作而不返回值的函数，如print_twice。定义一个fruitful function时，是希望能使用其结果，如将它赋值给变量或作为表达式的一...
>>> given = ['John', 'Eric', 'Terry', 'Michael'] >>> family = ['Cleese', 'Idle', 'Gilliam', 'Palin'] >>> pythons = dict(zip(given, family)) >>> print pythons {'John': 'Cleese', 'Michael': 'Palin', 'Eric': 'Idle', 'Terry': 'Gilliam'} ...
pattern=r"(?P.*) - (?P<level>[0-9]+) - (?P<message>.*)"# Regexwithnamed groups caster_dict=dict(time=dateutil.parser.parse,level=int)# Transform matching groupsforgroupsinlogger.parse("file.log",pattern,cast=caster_dict):print("Parsed:",groups)#{"level":30,"message":"Log exam...
We can access the docstring of the print_max function using the __doc__ (notice the double underscores) attribute (name belonging to) of the function. Just remember that Python treats everything as an object and this includes functions. We'll learn more about objects in the chapter on ...
#定义函数deffun_demo():#函数体print("这是一个函数")deffunc_with_params(a, b, c):"""这是一个携带参数和注释的函数"""print(f"传入的参数为: a={a}, b={b}, c={c}")#打印函数 comments 的内容#print(func_with_params.__doc__)#help(func_with_params)#定义空函数1deffilter_char(s...