在Python中的两个函数之间传递字符串变量

时间:2017-12-06 14:43:44

标签: python string variables

我无法将变量从一个函数传递到另一个函数:

def name():

    first_name=input("What is your name? ")

    if len(first_name)==0:
            print("\nYou did not enter a name!")
            return name()

    else:
            print("\nHello %s." % first_name)
            return surname()


def surname():

    last_name=input("\nCan you tell my your last name please?")

    if len(last_name)==0:
            print("\nYou did not enter a last name!")
            return surname()
    else:

            print("Nice to meet you %s %s." % (first_name,last_name))

我希望最后一个命令从def name()打印输入的first_name,从def surname()打印姓氏

我总是得到first_name未定义的错误,我不知道如何从第一个函数导入它。我得到的错误是:

    print("Nice to meet you %s %s." % (first_name,last_name))
NameError: name 'first_name' is not defined

我做错了什么?

3 个答案:

答案 0 :(得分:2)

您需要在函数调用中传递信息:

def name():

    first_name = input("What is your name? ")

    if len(first_name) == 0:
        print("\nYou did not enter a name!")
        return name()

    else:
        print("\nHello %s." % first_name)
        surname(first_name)  # pass first_name on to the surname function


def surname(first_name): #first_name arrives here ready to be used in this function

    last_name = input("\nCan you tell my your last name please?")

    if len(last_name) == 0:
        print("\nYou did not enter a last name!")
        surname(first_name)
    else:
        print("Nice to meet you %s %s." % (first_name,last_name))

name()

答案 1 :(得分:0)

def functionname(untypedparametername):
    # do smth with untypedparametername which holds "Jim" for this example   

name = "Jim"

functionname(name) # this will provide "Jim" to the function

如果查看文档中的示例,可以看到它们的用法。在这里:https://docs.python.org/3/library/functions.html

也许你应该阅读一些基础教程,你可以在python主页上找到很多这些教程:https://wiki.python.org/moin/BeginnersGuide

答案 2 :(得分:0)

您还可以使用while循环不断询问名称,直到有效输入为止。

def name_find():
   while True:
       first_name=raw_input("What is your name? ")
       if len(first_name)==0:
           print("\nYou did not enter a name!")
           return name_find()
       else:
           print("\nHello %s." % first_name)
           return surname(first_name)
def surname(first_name):
   while True:
      last_name=raw_input("\nCan you tell me your last name please?")
      if len(last_name)==0:
          print("\nYou did not enter a last name!")
     else:
          print "Nice to meet you %s %s." % (first_name, last_name)
          break