python nameERROR错误

Question

运行以下内容

golfFile = open("golf.dat","a")
another = "Y"
while another=="Y":
    Name = input("What is the player's name?: ")
    Score = input("What is the player's score?: ")
    golfFile.write(Name+"\n")
    golfFile.write(Score+"\n")
    another = input("Do you wish to enter another player? (Y for yes): ")
    print()
golfFile.close()
print("Data saved to golf.dat")

得到以下错误--玩家的名字是什么？：J

Traceback (most recent call last):
  File "C:\Users\Nancy\Desktop\Calhoun\CIS\Chapter10#6A.py", line 4, in <module>
    Name = input("What is the player's name?: ")
  File "<string>", line 1, in <module>
NameError: name 'j' is not defined

Answer 1

在Python2.7中，input尝试将输入计算为Python表达式，而raw_input则将其计算为字符串。显然，j不是一个有效的表达式。在某些情况下，使用input实际上是危险的--您不希望用户能够在应用程序中执行任意代码！

因此，您要寻找的是raw_input。

Python3没有raw_input，旧的raw_input被重命名为input。所以，如果您在Python 3中尝试了您的代码，它就会工作。

golfFile = open("golf.dat","a")
another = "Y"
while another=="Y":
    Name = raw_input("What is the player's name?: ")
    Score = raw_input("What is the player's score?: ")
    golfFile.write(Name+"\n")
    golfFile.write(Score+"\n")
    another = raw_input("Do you wish to enter another player? (Y for yes): ")
    print()
golfFile.close()
print("Data saved to golf.dat")

测试：

>>> Name = input("What is the player's name?: ")
What is the player's name?: j
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1, in <module>
NameError: name 'j' is not defined
>>> Name = raw_input("What is the player's name?: ")
What is the player's name?: j
>>> Name
'j'

Answer 2

您可能希望使用raw_input而不是input

Name = raw_input("What is the player's name?: ")
Score = raw_input("What is the player's score?: ")