Python|Python 14 Python14

课上代码

#形参和实参 >>> def MyFirstFunction(name): '函数定义过程中的name是形参' #因为它只是一个形式，表示占据一个参数位置 print('传递进来的' + name + '叫做实参，因为它是具体的参数值')>>> MyFirstFunction('Jack') 传递进来的Jack叫做实参，因为它是具体的参数值 >>> MyFirstFunction.__doc__ '函数定义过程中的name是形参' >>> help(MyFirstFunction) Help on function MyFirstFunction in module __main__:MyFirstFunction(name) 函数定义过程中的name是形参>>> print.__doc__ "print(value, ..., sep=' ', end='\\n', file=sys.stdout, flush=False)\n\nPrints the values to a stream, or to sys.stdout by default.\nOptional keyword arguments:\nfile:a file-like object (stream); defaults to the current sys.stdout.\nsep:string inserted between values, default a space.\nend:string appended after the last value, default a newline.\nflush: whether to forcibly flush the stream." >>> help(print) Help on built-in function print in module builtins:print(...) print(value, ..., sep=' ', end='\n', file=sys.stdout, flush=False)Prints the values to a stream, or to sys.stdout by default. Optional keyword arguments: file:a file-like object (stream); defaults to the current sys.stdout. sep:string inserted between values, default a space. end:string appended after the last value, default a newline. flush: whether to forcibly flush the stream.#关键字参数 >>> def SaySome(name, words): print(name + '->' + words)>>> SaySome('Jack', ' You are amazing') Jack-> You are amazing >>> SaySome('You are amazing', 'Jack') You are amazing->Jack >>> SaySome(words = 'You are amazing', name = 'Jack') Jack->You are amazing#默认参数 >>> def SaySome(name = 'Jack', words = 'You are amzing'): print(name + '->' + words) >>> SaySome() Jack->You are amzing >>> SaySome('Rose') Rose->You are amzing >>> SaySome('Rose', '你臭不要脸！') Rose->你臭不要脸！#收集参数 >>> def test(*params): print('参数的长度是： ', len(params)) print('第二个参数是： ', params[1]) >>> test(1, 'Jack', 3.14, 5, 6, 7, 8) 参数的长度是：7 第二个参数是：Jack >>> def test(*params, exp): print('参数的长度是：', len(params), exp) print('第二个参数是：', params[1])>>> test(1, 'Jack', 3.14, 5, 6, 7, 8) Traceback (most recent call last): File "", line 1, in test(1, 'Jack', 3.14, 5, 6, 7, 8) TypeError: test() missing 1 required keyword-only argument: 'exp' >>> test(1, 'Jack', 3.14, 5, 6, 7, exp = 8) 参数的长度是： 6 8 第二个参数是： Jack >>> def test(*params, exp = 8): print('参数的长度是：', len(params), exp) print('第二个参数是：', params[1])>>> test(1, 'Jack', 3.14, 5, 6, 7, 8) 参数的长度是： 7 8 第二个参数是： Jack

【Python|Python 14】二. 动动手

编写一个符合以下要求的函数：
a. 计算打印所有参数的和乘以基数(base = 3)的结果
b. 如果参数中最后一个参数为(base = 5), 则设定基数为5，基数不参与求和计算

def mFun(*param, base = 3): result = 0 for each in param: result += each result *= base print('The result is ', result)mFun(1, 2, 3, 4, 5, base = 5)

寻找水仙花数

#个人代码 for i in range(100, 1000): a = i % 10 b = i // 10 % 10 c = i // 100 if i == a ** 3 + b ** 3 + c ** 3: print(i)

#参考代码 def Narcissus(): for each in range(100, 1000): temp = each sum = 0 while temp: sum = sum + (temp % 10) ** 3 temp = temp // 10 #这一步很巧妙呀if sum == each: print(each, end = '\t')print("Narcissus is ", end = '') Narcissus()

编写一个函数findstr()，该函数统计一个长度为2的子字符串在另一个字符串中出现的次数

#个人代码 #但是不会把它转变成函数模式 num = 0 total_string = input("Please input your string: ") check_string = input('Please input your checking string: ') length = len(total_string) - 1 for i in range(length): if check_string[0] == total_string[i] and check_string[1] == total_string[i+1]: num += 1 print('Song string have been appearing {} times'.format(num))

#参考代码 def findStr(desStr, subStr): count = 0 length = len(desStr) if subStr not in desStr: print('No finding') else: for each1 in range(length - 1): if desStr[each1] == subStr[0]: if desStr[each1 + 1] == subStr[1]: count += 1 print('The checking string is appearing %d times' % count)desStr = input("Please input your string: ") subStr = input("Please input your checking string: ") findStr(desStr, subStr)