Question

我试图建立一个在线MASH游戏。我如何输出：

print＆＃34;欢迎使用程序{} {}＆＃34; .format（self.first_name，self.last_name）如果没有输入中间名但是：

print＆＃34;欢迎使用程序{} {} {}＆＃34; .format（self.first_name，self.middle_name，self.last_name）如果输入了中间名：

类名称（对象）：

def __init__(self, first_name='', last_name='', middle_name=''):
    if not first_name:
        first_name = raw_input("What is your first name: ")
    if not last_name:
        last_name = raw_input("What is your last name: ")
    if not middle_name:
        middle_name = raw_input("What is your middle name[Leave blank if not applicable]: ")
        if middle_name == '':
            print "No middle name here!"
    self.first_name = first_name
    self.last_name = last_name
    self.middle_name = middle_name
    self.print_name()

def print_name(self):
    if not middle_name:
        print "Welcome to the program {} {}".format(self.first_name, self.last_name)
    else:
        print "Welcome to the program {} {} {}".format(self.first_name,
                                                   self.middle_name,
                                                   self.last_name)

chris = Name（）

Answer 1

这似乎是你所描述的行为：

class Name (object):

    def __init__(self, first_name, last_name, middle_name=None):
        self.first_name = first_name
        self.last_name = last_name
        self.middle_name = middle_name
        self.print_name()

    def print_name(self):
        if not self.middle_name:
            print "Welcome to the program {} {}".format(self.first_name, self.last_name)
        else:
            print "Welcome to the program {} {} {}".format(self.first_name, self.middle_name, self.last_name)

chris_jones = Name(first_name='Chris', last_name='Jones')
chris_taylor_jones = Name(first_name='Chris', middle_name='Taylor', last_name='Jones')

注意我只在您的None方法中添加了__init__()参数。如果来电者未提供middle_name=None参数，middle_name会提供默认值。 This syntactic feature is called a "keyword argument"

输出：

Welcome to the program Chris Jones
Welcome to the program Chris Taylor Jones

Python 2.7如果middle_name为null，则打印其他东西

1 个答案: